gzdoom/src/p_mobj.cpp

// Emacs style mode select	 -*- C++ -*- 
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// $Log:$
//
// DESCRIPTION:
//		Moving object handling. Spawn functions.
//
//-----------------------------------------------------------------------------

// HEADER FILES ------------------------------------------------------------

#include "templates.h"
#include "i_system.h"
#include "m_random.h"
#include "doomdef.h"
#include "p_local.h"
#include "p_lnspec.h"
#include "p_effect.h"
#include "p_terrain.h"
#include "st_stuff.h"
#include "hu_stuff.h"
#include "s_sound.h"
#include "doomstat.h"
#include "v_video.h"
#include "c_cvars.h"
#include "b_bot.h"	//Added by MC:
#include "stats.h"
#include "a_hexenglobal.h"
#include "a_sharedglobal.h"
#include "gi.h"
#include "sbar.h"
#include "p_acs.h"
#include "cmdlib.h"
#include "decallib.h"
#include "ravenshared.h"
#include "a_action.h"
#include "a_keys.h"
#include "p_conversation.h"
#include "thingdef/thingdef.h"
#include "g_game.h"
#include "teaminfo.h"
#include "r_translate.h"
#include "r_sky.h"
#include "g_level.h"
#include "d_event.h"
#include "colormatcher.h"
#include "v_palette.h"
#include "p_enemy.h"

// MACROS ------------------------------------------------------------------

#define WATER_SINK_FACTOR		3
#define WATER_SINK_SMALL_FACTOR	4
#define WATER_SINK_SPEED		(FRACUNIT/2)
#define WATER_JUMP_SPEED		(FRACUNIT*7/2)

// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------

void G_PlayerReborn (int player);

// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------

static void PlayerLandedOnThing (AActor *mo, AActor *onmobj);

// EXTERNAL DATA DECLARATIONS ----------------------------------------------

extern cycle_t BotSupportCycles;
extern int BotWTG;
EXTERN_CVAR (Bool, r_drawfuzz);
EXTERN_CVAR (Int,  cl_rockettrails)

// PRIVATE DATA DEFINITIONS ------------------------------------------------

static FRandom pr_explodemissile ("ExplodeMissile");
FRandom pr_bounce ("Bounce");
static FRandom pr_reflect ("Reflect");
static FRandom pr_nightmarerespawn ("NightmareRespawn");
static FRandom pr_botspawnmobj ("BotSpawnActor");
static FRandom pr_spawnmapthing ("SpawnMapThing");
static FRandom pr_spawnpuff ("SpawnPuff");
static FRandom pr_spawnblood ("SpawnBlood");
static FRandom pr_splatter ("BloodSplatter");
static FRandom pr_takedamage ("TakeDamage");
static FRandom pr_splat ("FAxeSplatter");
static FRandom pr_ripperblood ("RipperBlood");
static FRandom pr_chunk ("Chunk");
static FRandom pr_checkmissilespawn ("CheckMissileSpawn");
static FRandom pr_spawnmissile ("SpawnMissile");
static FRandom pr_missiledamage ("MissileDamage");
 FRandom pr_slam ("SkullSlam");
static FRandom pr_multiclasschoice ("MultiClassChoice");
static FRandom pr_rockettrail("RocketTrail");

// PUBLIC DATA DEFINITIONS -------------------------------------------------

FRandom pr_spawnmobj ("SpawnActor");

CUSTOM_CVAR (Float, sv_gravity, 800.f, CVAR_SERVERINFO|CVAR_NOSAVE)
{
	level.gravity = self;
}

CVAR (Bool, cl_missiledecals, true, CVAR_ARCHIVE)
CVAR (Bool, addrocketexplosion, false, CVAR_ARCHIVE)

fixed_t FloatBobOffsets[64] =
{
	0, 51389, 102283, 152192,
	200636, 247147, 291278, 332604,
	370727, 405280, 435929, 462380,
	484378, 501712, 514213, 521763,
	524287, 521763, 514213, 501712,
	484378, 462380, 435929, 405280,
	370727, 332604, 291278, 247147,
	200636, 152192, 102283, 51389,
	-1, -51390, -102284, -152193,
	-200637, -247148, -291279, -332605,
	-370728, -405281, -435930, -462381,
	-484380, -501713, -514215, -521764,
	-524288, -521764, -514214, -501713,
	-484379, -462381, -435930, -405280,
	-370728, -332605, -291279, -247148,
	-200637, -152193, -102284, -51389
};

fixed_t FloatBobDiffs[64] =
{
	51389, 51389, 50894, 49909, 48444,
	46511, 44131, 41326, 38123,
	34553, 30649, 26451, 21998,
	17334, 12501, 7550, 2524,
	-2524, -7550, -12501, -17334,
	-21998, -26451, -30649, -34553,
	-38123, -41326, -44131, -46511,
	-48444, -49909, -50894, -51390,
	-51389, -50894, -49909, -48444,
	-46511, -44131, -41326, -38123,
	-34553, -30649, -26451, -21999,
	-17333, -12502, -7549, -2524,
	2524, 7550, 12501, 17334,
	21998, 26451, 30650, 34552,
	38123, 41326, 44131, 46511,
	48444, 49909, 50895
};

CVAR (Int, cl_pufftype, 0, CVAR_ARCHIVE);
CVAR (Int, cl_bloodtype, 0, CVAR_ARCHIVE);

// CODE --------------------------------------------------------------------

IMPLEMENT_POINTY_CLASS (AActor)
 DECLARE_POINTER (target)
 DECLARE_POINTER (lastenemy)
 DECLARE_POINTER (tracer)
 DECLARE_POINTER (goal)
 DECLARE_POINTER (LastLookActor)
 DECLARE_POINTER (Inventory)
 DECLARE_POINTER (LastHeard)
 DECLARE_POINTER (master)
END_POINTERS

AActor::~AActor ()
{
	// Please avoid calling the destructor directly (or through delete)!
	// Use Destroy() instead.
}

void AActor::Serialize (FArchive &arc)
{
	Super::Serialize (arc);

	if (arc.IsStoring ())
	{
		arc.WriteSprite (sprite);
	}
	else
	{
		sprite = arc.ReadSprite ();
	}

	arc << x
		<< y
		<< z
		<< angle
		<< frame
		<< scaleX
		<< scaleY
		<< RenderStyle
		<< renderflags
		<< picnum
		<< floorpic
		<< ceilingpic
		<< TIDtoHate
		<< LastLookPlayerNumber
		<< LastLookActor
		<< effects
		<< alpha
		<< fillcolor
		<< pitch
		<< roll
		<< Sector
		<< floorz
		<< ceilingz
		<< dropoffz
		<< floorsector
		<< ceilingsector
		<< radius
		<< height
		<< projectilepassheight
		<< velx
		<< vely
		<< velz
		<< tics
		<< state
		<< Damage
		<< flags
		<< flags2
		<< flags3
		<< flags4
		<< flags5
		<< flags6
		<< special1
		<< special2
		<< health
		<< movedir
		<< visdir
		<< movecount
		<< strafecount
		<< target
		<< lastenemy
		<< LastHeard
		<< reactiontime
		<< threshold
		<< player
		<< SpawnPoint[0] << SpawnPoint[1] << SpawnPoint[2]
		<< SpawnAngle
		<< skillrespawncount
		<< tracer
		<< floorclip
		<< tid
		<< special
		<< args[0] << args[1] << args[2] << args[3] << args[4]
		<< goal
		<< waterlevel
		<< MinMissileChance
		<< SpawnFlags
		<< Inventory
		<< InventoryID
		<< id
		<< FloatBobPhase
		<< Translation
		<< SeeSound
		<< AttackSound
		<< PainSound
		<< DeathSound
		<< ActiveSound
		<< UseSound
		<< BounceSound
		<< WallBounceSound
		<< Speed
		<< FloatSpeed
		<< Mass
		<< PainChance
		<< SpawnState
		<< SeeState
		<< MeleeState
		<< MissileState
		<< MaxDropOffHeight 
		<< MaxStepHeight
		<< BounceFlags
		<< bouncefactor
		<< wallbouncefactor
		<< bouncecount
		<< maxtargetrange
		<< meleethreshold
		<< meleerange
		<< DamageType
		<< gravity
		<< FastChaseStrafeCount
		<< master
		<< smokecounter
		<< BlockingMobj
		<< BlockingLine
		<< pushfactor
		<< Species
		<< Score
		<< Tag;
	if (SaveVersion >= 1904)
	{
		arc << lastpush << lastbump;
	}

	if (SaveVersion >= 1900)
	{
		arc << PainThreshold;
	}
	if (SaveVersion >= 1914)
	{
		arc << DamageFactor;
	}

	// Skip past uservar array in old savegames
	if (SaveVersion < 1933)
	{
		int foo;
		for (int i = 0; i < 10; ++i)
			arc << foo;
	}

	if (arc.IsStoring ())
	{
		int convnum = 0;
		unsigned int i;

		if (Conversation != NULL)
		{
			for (i = 0; i < StrifeDialogues.Size(); ++i)
			{
				if (StrifeDialogues[i] == GetDefault()->Conversation)
				{
					break;
				}
			}
			for (; i + convnum < StrifeDialogues.Size(); ++convnum)
			{
				if (StrifeDialogues[i + convnum] == Conversation)
				{
					break;
				}
			}
			if (i + convnum < StrifeDialogues.Size())
			{
				convnum++;
			}
			else
			{
				convnum = 0;
			}
		}
		arc.WriteCount (convnum);
	}
	else
	{
		int convnum;
		unsigned int i;

		convnum = arc.ReadCount();
		if (convnum == 0 || GetDefault()->Conversation == NULL)
		{
			Conversation = NULL;
		}
		else
		{
			for (i = 0; i < StrifeDialogues.Size(); ++i)
			{
				if (StrifeDialogues[i] == GetDefault()->Conversation)
				{
					break;
				}
			}
			if (i + convnum <= StrifeDialogues.Size())
			{
				Conversation = StrifeDialogues[i + convnum - 1];
			}
			else
			{
				Conversation = GetDefault()->Conversation;
			}
		}
	}

	if (arc.IsLoading ())
	{
		touching_sectorlist = NULL;
		LinkToWorld (Sector);
		AddToHash ();
		SetShade (fillcolor);
		if (player)
		{
			if (playeringame[player - players] && 
				player->cls != NULL &&
				state->sprite == 
				GetDefaultByType (player->cls)->SpawnState->sprite)
			{ // Give player back the skin
				sprite = skins[player->userinfo.skin].sprite;
				scaleX = skins[player->userinfo.skin].ScaleX;
				scaleY = skins[player->userinfo.skin].ScaleY;
			}
			if (Speed == 0)
			{
				Speed = GetDefault()->Speed;
			}
		}
		PrevX = x;
		PrevY = y;
		PrevZ = z;
		UpdateWaterLevel(z, false);
	}
}

void FMapThing::Serialize (FArchive &arc)
{
	arc << thingid << x << y << z << angle << type << flags << special
		<< args[0] << args[1] << args[2] << args[3] << args[4];
}

AActor::AActor () throw()
{
}

AActor::AActor (const AActor &other) throw()
{
	memcpy (&x, &other.x, (BYTE *)&this[1] - (BYTE *)&x);
}

AActor &AActor::operator= (const AActor &other)
{
	memcpy (&x, &other.x, (BYTE *)&this[1] - (BYTE *)&x);
	return *this;
}

//==========================================================================
//
// AActor::InStateSequence
//
// Checks whether the current state is in a contiguous sequence that
// starts with basestate
//
//==========================================================================

bool AActor::InStateSequence(FState * newstate, FState * basestate)
{
	if (basestate == NULL) return false;

	FState * thisstate = basestate;
	do
	{
		if (newstate == thisstate) return true;
		basestate = thisstate;
		thisstate = thisstate->GetNextState();
	}
	while (thisstate == basestate+1);
	return false;
}

//==========================================================================
//
// AActor::GetTics
//
// Get the actual duration of the next state
// This is a more generalized attempt to make the Demon faster in
// nightmare mode. Actually changing the states' durations has to
// be considered highly problematic.
//
//==========================================================================

int AActor::GetTics(FState * newstate)
{
	int tics = newstate->GetTics();
	
	if (isFast())
	{
		if (flags5 & MF5_FASTER)
		{
			if (InStateSequence(newstate, SeeState)) return tics - (tics>>1);
		}
		if (flags5 & MF5_FASTMELEE)
		{
			if (InStateSequence(newstate, MeleeState)) return tics - (tics>>1);
		}
	}
	return tics;
}

//==========================================================================
//
// AActor::SetState
//
// Returns true if the mobj is still present.
//
//==========================================================================

bool AActor::SetState (FState *newstate)
{
	if (debugfile && player && (player->cheats & CF_PREDICTING))
		fprintf (debugfile, "for pl %td: SetState while predicting!\n", player-players);
	do
	{
		if (newstate == NULL)
		{
			state = NULL;
			Destroy ();
			return false;
		}
		int prevsprite, newsprite;

		if (state != NULL)
		{
			prevsprite = state->sprite;
		}
		else
		{
			prevsprite = -1;
		}
		state = newstate;
		tics = GetTics(newstate);
		renderflags = (renderflags & ~RF_FULLBRIGHT) | newstate->GetFullbright();
		newsprite = newstate->sprite;
		if (newsprite != 1)
		{
			// Sprite 1 is ----, which means "do not change the sprite"
			frame = newstate->GetFrame();

			if (!(flags4 & MF4_NOSKIN) && newsprite == SpawnState->sprite)
			{ // [RH] If the new sprite is the same as the original sprite, and
			// this actor is attached to a player, use the player's skin's
			// sprite. If a player is not attached, do not change the sprite
			// unless it is different from the previous state's sprite; a
			// player may have been attached, died, and respawned elsewhere,
			// and we do not want to lose the skin on the body. If it wasn't
			// for Dehacked, I would move sprite changing out of the states
			// altogether, since actors rarely change their sprites after
			// spawning.
				if (player != NULL)
				{
					sprite = skins[player->userinfo.skin].sprite;
				}
				else if (newsprite != prevsprite)
				{
					sprite = newsprite;
				}
			}
			else
			{
				sprite = newsprite;
			}
		}

		if (newstate->CallAction(this, this))
		{
			// Check whether the called action function resulted in destroying the actor
			if (ObjectFlags & OF_EuthanizeMe)
				return false;
		}
		newstate = newstate->GetNextState();
	} while (tics == 0);

	screen->StateChanged(this);
	return true;
}

//----------------------------------------------------------------------------
//
// FUNC AActor::SetStateNF
//
// Same as SetState, but does not call the state function.
//
//----------------------------------------------------------------------------

bool AActor::SetStateNF (FState *newstate)
{
	do
	{
		if (newstate == NULL)
		{
			state = NULL;
			Destroy ();
			return false;
		}
		int prevsprite, newsprite;

		if (state != NULL)
		{
			prevsprite = state->sprite;
		}
		else
		{
			prevsprite = -1;
		}
		state = newstate;
		tics = GetTics(newstate);
		renderflags = (renderflags & ~RF_FULLBRIGHT) | newstate->GetFullbright();
		newsprite = newstate->sprite;
		if (newsprite != 1)
		{
			// Sprite 1 is ----, which means "do not change the sprite"

			frame = newstate->GetFrame();
			if (!(flags4 & MF4_NOSKIN) && newsprite == SpawnState->sprite)
			{
				if (player != NULL && gameinfo.gametype != GAME_Hexen)
				{
					sprite = skins[player->userinfo.skin].sprite;
				}
				else if (newsprite != prevsprite)
				{
					sprite = newsprite;
				}
			}
			else
			{
				sprite = newsprite;
			}
		}
		newstate = newstate->GetNextState();
	} while (tics == 0);

	screen->StateChanged(this);
	return true;
}

//============================================================================
//
// AActor :: AddInventory
//
//============================================================================

void AActor::AddInventory (AInventory *item)
{
	// Check if it's already attached to an actor
	if (item->Owner != NULL)
	{
		// Is it attached to us?
		if (item->Owner == this)
			return;

		// No, then remove it from the other actor first
		item->Owner->RemoveInventory (item);
	}

	item->Owner = this;
	item->Inventory = Inventory;
	Inventory = item;

	// Each item receives an unique ID when added to an actor's inventory.
	// This is used by the DEM_INVUSE command to identify the item. Simply
	// using the item's position in the list won't work, because ticcmds get
	// run sometime in the future, so by the time it runs, the inventory
	// might not be in the same state as it was when DEM_INVUSE was sent.
	Inventory->InventoryID = InventoryID++;
}

//============================================================================
//
// AActor :: RemoveInventory
//
//============================================================================

void AActor::RemoveInventory (AInventory *item)
{
	AInventory *inv, **invp;

	invp = &item->Owner->Inventory;
	for (inv = *invp; inv != NULL; invp = &inv->Inventory, inv = *invp)
	{
		if (inv == item)
		{
			*invp = item->Inventory;
			item->DetachFromOwner ();
			item->Owner = NULL;
			break;
		}
	}
}

//============================================================================
//
// AActor :: DestroyAllInventory
//
//============================================================================

void AActor::DestroyAllInventory ()
{
	while (Inventory != NULL)
	{
		AInventory *item = Inventory;
		item->Destroy ();
		assert (item != Inventory);
	}
}

//============================================================================
//
// AActor :: FirstInv
//
// Returns the first item in this actor's inventory that has IF_INVBAR set.
//
//============================================================================

AInventory *AActor::FirstInv ()
{
	if (Inventory == NULL)
	{
		return NULL;
	}
	if (Inventory->ItemFlags & IF_INVBAR)
	{
		return Inventory;
	}
	return Inventory->NextInv ();
}

//============================================================================
//
// AActor :: UseInventory
//
// Attempts to use an item. If the use succeeds, one copy of the item is
// removed from the inventory. If all copies are removed, then the item is
// destroyed.
//
//============================================================================

bool AActor::UseInventory (AInventory *item)
{
	// No using items if you're dead.
	if (health <= 0)
	{
		return false;
	}
	// Don't use it if you don't actually have any of it.
	if (item->Amount <= 0 || (item->ObjectFlags & OF_EuthanizeMe))
	{
		return false;
	}
	if (!item->Use (false))
	{
		return false;
	}

	if (dmflags2 & DF2_INFINITE_INVENTORY)
		return true;

	if (--item->Amount <= 0 && !(item->ItemFlags & IF_KEEPDEPLETED))
	{
		item->Destroy ();
	}
	return true;
}

//===========================================================================
//
// AActor :: DropInventory
//
// Removes a single copy of an item and throws it out in front of the actor.
//
//===========================================================================

AInventory *AActor::DropInventory (AInventory *item)
{
	fixed_t dropdist;
	angle_t an;
	AInventory *drop = item->CreateTossable ();

	if (drop == NULL)
	{
		return NULL;
	}
	an = angle >> ANGLETOFINESHIFT;
	/* 92682 = sqrt(2) * FRACUNIT */
	dropdist = FixedMul (92682, radius + 8*FRACUNIT + item->radius);
	drop->x = x;
	drop->y = y;
	drop->z = z + 10*FRACUNIT;
	P_TryMove (drop, x, y, true);
	drop->angle = angle;
	drop->velx = velx + 5 * finecosine[an];
	drop->vely = vely + 5 * finesine[an];
	drop->velz = velz + FRACUNIT;
	drop->flags &= ~MF_NOGRAVITY;	// Don't float
	return drop;
}

//============================================================================
//
// AActor :: FindInventory
//
//============================================================================

AInventory *AActor::FindInventory (const PClass *type)
{
	AInventory *item;

	if (type == NULL) return NULL;

	assert (type->ActorInfo != NULL);
	for (item = Inventory; item != NULL; item = item->Inventory)
	{
		if (item->GetClass() == type)
		{
			break;
		}
	}
	return item;
}

AInventory *AActor::FindInventory (FName type)
{
	return FindInventory(PClass::FindClass(type));
}

//============================================================================
//
// AActor :: GiveInventoryType
//
//============================================================================

AInventory *AActor::GiveInventoryType (const PClass *type)
{
	AInventory *item = NULL;

	if (type != NULL)
	{
		item = static_cast<AInventory *>(Spawn (type, 0,0,0, NO_REPLACE));
		if (!item->CallTryPickup (this))
		{
			item->Destroy ();
			return NULL;
		}
	}
	return item;
}

//============================================================================
//
// AActor :: GiveAmmo
//
// Returns true if the ammo was added, false if not.
//
//============================================================================

bool AActor::GiveAmmo (const PClass *type, int amount)
{
	if (type != NULL)
	{
		AInventory *item = static_cast<AInventory *>(Spawn (type, 0, 0, 0, NO_REPLACE));
		if (item)
		{
			item->Amount = amount;
			item->flags |= MF_DROPPED;
			if (!item->CallTryPickup (this))
			{
				item->Destroy ();
				return false;
			}
			return true;
		}
	}
	return false;
}

//============================================================================
//
// AActor :: CopyFriendliness
//
// Makes this actor hate (or like) the same things another actor does.
//
//============================================================================

void AActor::CopyFriendliness (AActor *other, bool changeTarget)
{
	level.total_monsters -= CountsAsKill();
	TIDtoHate = other->TIDtoHate;
	LastLookActor = other->LastLookActor;
	LastLookPlayerNumber = other->LastLookPlayerNumber;
	flags  = (flags & ~MF_FRIENDLY) | (other->flags & MF_FRIENDLY);
	flags3 = (flags3 & ~(MF3_NOSIGHTCHECK | MF3_HUNTPLAYERS)) | (other->flags3 & (MF3_NOSIGHTCHECK | MF3_HUNTPLAYERS));
	flags4 = (flags4 & ~MF4_NOHATEPLAYERS) | (other->flags4 & MF4_NOHATEPLAYERS);
	FriendPlayer = other->FriendPlayer;
	if (changeTarget && other->target != NULL && !(other->target->flags3 & MF3_NOTARGET))
	{
		// LastHeard must be set as well so that A_Look can react to the new target if called
		LastHeard = target = other->target;
	}	
	health = SpawnHealth();	
	level.total_monsters += CountsAsKill();
}

//============================================================================
//
// AActor :: ObtainInventory
//
// Removes the items from the other actor and puts them in this actor's
// inventory. The actor receiving the inventory must not have any items.
//
//============================================================================

void AActor::ObtainInventory (AActor *other)
{
	assert (Inventory == NULL);

	Inventory = other->Inventory;
	InventoryID = other->InventoryID;
	other->Inventory = NULL;
	other->InventoryID = 0;

	if (other->IsKindOf(RUNTIME_CLASS(APlayerPawn)) && this->IsKindOf(RUNTIME_CLASS(APlayerPawn)))
	{
		APlayerPawn *you = static_cast<APlayerPawn *>(other);
		APlayerPawn *me = static_cast<APlayerPawn *>(this);
		me->InvFirst = you->InvFirst;
		me->InvSel = you->InvSel;
		you->InvFirst = NULL;
		you->InvSel = NULL;
	}

	AInventory *item = Inventory;
	while (item != NULL)
	{
		item->Owner = this;
		item = item->Inventory;
	}
}

//============================================================================
//
// AActor :: CheckLocalView
//
// Returns true if this actor is local for the player. Here, local means the
// player is either looking out this actor's eyes, or this actor is the player
// and the player is looking out the eyes of something non-"sentient."
//
//============================================================================

bool AActor::CheckLocalView (int playernum) const
{
	if (players[playernum].camera == this)
	{
		return true;
	}
	if (players[playernum].mo != this || players[playernum].camera == NULL)
	{
		return false;
	}
	if (players[playernum].camera->player == NULL &&
		!(players[playernum].camera->flags3 & MF3_ISMONSTER))
	{
		return true;
	}
	return false;
}

//============================================================================
//
// AActor :: ConversationAnimation
//
// Plays a conversation-related animation:
//	 0 = greeting
//   1 = "yes"
//   2 = "no"
//
//============================================================================

void AActor::ConversationAnimation (int animnum)
{
	FState * state = NULL;
	switch (animnum)
	{
	case 0:
		state = FindState(NAME_Greetings);
		break;
	case 1:
		state = FindState(NAME_Yes);
		break;
	case 2:
		state = FindState(NAME_No);
		break;
	}
	if (state != NULL) SetState(state);
}

//============================================================================
//
// AActor :: Touch
//
// Something just touched this actor. Normally used only for inventory items,
// but some Strife monsters also use it.
//
//============================================================================

void AActor::Touch (AActor *toucher)
{
}

//============================================================================
//
// AActor :: Grind
//
// Handles the an actor being crushed by a door, crusher or polyobject.
// Originally part of P_DoCrunch(), it has been made into its own actor
// function so that it could be called from a polyobject without hassle.
// Bool items is true if it should destroy() dropped items, false otherwise.
//============================================================================

bool AActor::Grind(bool items)
{
	// crunch bodies to giblets
	if ((flags & MF_CORPSE) && !(flags3 & MF3_DONTGIB) && (health <= 0))
	{
		FState * state = FindState(NAME_Crush);
		bool isgeneric = false;
		// ZDoom behavior differs from standard as crushed corpses cannot be raised.
		// The reason for the change was originally because of a problem with players,
		// see rh_log entry for February 21, 1999. Don't know if it is still relevant.
		if (state == NULL 												// Only use the default crushed state if:
			&& !(flags & MF_NOBLOOD)						// 1. the monster bleeeds,
			&& (i_compatflags & COMPATF_CORPSEGIBS)			// 2. the compat setting is on,
			&& player != NULL)								// 3. and the thing isn't a player.
		{
			isgeneric = true;
			state = FindState(NAME_GenericCrush);
			if (state != NULL && (sprites[state->sprite].numframes <= 0))
				state = NULL; // If one of these tests fails, do not use that state.
		}
		if (state != NULL && !(flags & MF_ICECORPSE))
		{
			if (this->flags4 & MF4_BOSSDEATH) 
			{
				CALL_ACTION(A_BossDeath, this);
			}
			flags &= ~MF_SOLID;
			flags3 |= MF3_DONTGIB;
			height = radius = 0;
			SetState (state);
			if (isgeneric)	// Not a custom crush state, so colorize it appropriately.
			{
				S_Sound (this, CHAN_BODY, "misc/fallingsplat", 1, ATTN_IDLE);
				PalEntry bloodcolor = PalEntry(GetClass()->Meta.GetMetaInt(AMETA_BloodColor));
				if (bloodcolor!=0) Translation = TRANSLATION(TRANSLATION_Blood, bloodcolor.a);
			}
			return false;
		}
		if (!(flags & MF_NOBLOOD))
		{
			if (this->flags4 & MF4_BOSSDEATH) 
			{
				CALL_ACTION(A_BossDeath, this);
			}

			const PClass *i = PClass::FindClass("RealGibs");

			if (i != NULL)
			{
				i = i->ActorInfo->GetReplacement()->Class;

				const AActor *defaults = GetDefaultByType (i);
				if (defaults->SpawnState == NULL ||
					sprites[defaults->SpawnState->sprite].numframes == 0)
				{ 
					i = NULL;
				}
			}
			if (i == NULL)
			{
				// if there's no gib sprite don't crunch it.
				flags &= ~MF_SOLID;
				flags3 |= MF3_DONTGIB;
				height = radius = 0;
				return false;
			}

			AActor *gib = Spawn (i, x, y, z, ALLOW_REPLACE);
			if (gib != NULL)
			{
				gib->RenderStyle = RenderStyle;
				gib->alpha = alpha;
				gib->height = 0;
				gib->radius = 0;
			}
			S_Sound (this, CHAN_BODY, "misc/fallingsplat", 1, ATTN_IDLE);

			PalEntry bloodcolor = (PalEntry)this->GetClass()->Meta.GetMetaInt(AMETA_BloodColor);
			if (bloodcolor!=0) gib->Translation = TRANSLATION(TRANSLATION_Blood, bloodcolor.a);
		}
		if (flags & MF_ICECORPSE)
		{
			tics = 1;
			velx = vely = velz = 0;
		}
		else if (player)
		{
			flags |= MF_NOCLIP;
			flags3 |= MF3_DONTGIB;
			renderflags |= RF_INVISIBLE;
		}
		else
		{
			Destroy ();
		}
		return false;		// keep checking
	}

	// crunch dropped items
	if (flags & MF_DROPPED)
	{
		if (items) Destroy (); // Only destroy dropped items if wanted
		return false;		// keep checking
	}

	// killough 11/98: kill touchy things immediately
	if (flags6 & MF6_TOUCHY && (flags6 & MF6_ARMED || IsSentient()))
    {
		flags6 &= ~MF6_ARMED; // Disarm
		P_DamageMobj (this, NULL, NULL, health, NAME_Crush, DMG_FORCED);  // kill object
		return true;   // keep checking
    }

	if (!(flags & MF_SOLID) || (flags & MF_NOCLIP))
	{
		return false;
	}

	if (!(flags & MF_SHOOTABLE))
	{
		return false;		// assume it is bloody gibs or something
	}
	return true;
}

//============================================================================
//
// AActor :: Massacre
//
// Called by the massacre cheat to kill monsters. Returns true if the monster
// was killed and false if it was already dead.
//============================================================================

bool AActor::Massacre ()
{
	int prevhealth;

	if (health > 0)
	{
		flags |= MF_SHOOTABLE;
		flags2 &= ~(MF2_DORMANT|MF2_INVULNERABLE);
		do
		{
			prevhealth = health;
			P_DamageMobj (this, NULL, NULL, TELEFRAG_DAMAGE, NAME_Massacre);
		}
		while (health != prevhealth && health > 0);	//abort if the actor wasn't hurt.
		return true;
	}
	return false;
}

//----------------------------------------------------------------------------
//
// PROC P_ExplodeMissile
//
//----------------------------------------------------------------------------

void P_ExplodeMissile (AActor *mo, line_t *line, AActor *target)
{
	if (mo->flags3 & MF3_EXPLOCOUNT)
	{
		if (++mo->special2 < mo->special1)
		{
			return;
		}
	}
	mo->velx = mo->vely = mo->velz = 0;
	mo->effects = 0;		// [RH]
	
	FState *nextstate=NULL;
	
	if (target != NULL && target->flags & (MF_SHOOTABLE|MF_CORPSE))
	{
		if (target->flags & MF_NOBLOOD) nextstate = mo->FindState(NAME_Crash);
		if (nextstate == NULL) nextstate = mo->FindState(NAME_Death, NAME_Extreme);
	}
	if (nextstate == NULL) nextstate = mo->FindState(NAME_Death);
	mo->SetState (nextstate);
	
	if (mo->ObjectFlags & OF_EuthanizeMe)
	{
		return;
	}

	if (line != NULL && line->special == Line_Horizon)
	{
		// [RH] Don't explode missiles on horizon lines.
		mo->Destroy ();
		return;
	}

	if (line != NULL && cl_missiledecals)
	{
		int side = P_PointOnLineSide (mo->x, mo->y, line);
		if (line->sidedef[side] == NULL)
			side ^= 1;
		if (line->sidedef[side] != NULL)
		{
			FDecalBase *base = mo->DecalGenerator;
			if (base != NULL)
			{
				// Find the nearest point on the line, and stick a decal there
				fixed_t x, y, z;
				SQWORD num, den;

				den = (SQWORD)line->dx*line->dx + (SQWORD)line->dy*line->dy;
				if (den != 0)
				{
					SDWORD frac;

					num = (SQWORD)(mo->x-line->v1->x)*line->dx+(SQWORD)(mo->y-line->v1->y)*line->dy;
					if (num <= 0)
					{
						frac = 0;
					}
					else if (num >= den)
					{
						frac = 1<<30;
					}
					else
					{
						frac = (SDWORD)(num / (den>>30));
					}

					x = line->v1->x + MulScale30 (line->dx, frac);
					y = line->v1->y + MulScale30 (line->dy, frac);
					z = mo->z;

					F3DFloor * ffloor=NULL;
#ifdef _3DFLOORS
					if (line->sidedef[side^1] != NULL)
					{
						sector_t * backsector = line->sidedef[side^1]->sector;
						extsector_t::xfloor &xf = backsector->e->XFloor;
						// find a 3D-floor to stick to
						for(unsigned int i=0;i<xf.ffloors.Size();i++)
						{
							F3DFloor * rover=xf.ffloors[i];

							if ((rover->flags&(FF_EXISTS|FF_SOLID|FF_RENDERSIDES))==(FF_EXISTS|FF_SOLID|FF_RENDERSIDES))
							{
								if (z<=rover->top.plane->ZatPoint(x, y) && z>=rover->bottom.plane->ZatPoint( x, y))
								{
									ffloor=rover;
									break;
								}
							}
						}
					}
#endif

					DImpactDecal::StaticCreate (base->GetDecal (),
						x, y, z, line->sidedef[side], ffloor);
				}
			}
		}
	}

	if (nextstate != NULL)
	{
		// [RH] Change render style of exploding rockets
		if (mo->flags5 & MF5_DEHEXPLOSION)
		{
			if (deh.ExplosionStyle == 255)
			{
				if (addrocketexplosion)
				{
					mo->RenderStyle = STYLE_Add;
					mo->alpha = FRACUNIT;
				}
				else
				{
					mo->RenderStyle = STYLE_Translucent;
					mo->alpha = FRACUNIT*2/3;
				}
			}
			else
			{
				mo->RenderStyle = ERenderStyle(deh.ExplosionStyle);
				mo->alpha = deh.ExplosionAlpha;
			}
		}

		if (mo->flags4 & MF4_RANDOMIZE)
		{
			mo->tics -= (pr_explodemissile() & 3) * TICRATE / 35;
			if (mo->tics < 1)
				mo->tics = 1;
		}

		mo->flags &= ~MF_MISSILE;

		if (mo->DeathSound)
		{
			S_Sound (mo, CHAN_VOICE, mo->DeathSound, 1,
				(mo->flags3 & MF3_FULLVOLDEATH) ? ATTN_NONE : ATTN_NORM);
		}
	}
}


void AActor::PlayBounceSound(bool onfloor)
{
	if (!onfloor && (BounceFlags & BOUNCE_NoWallSound))
	{
		return;
	}

	if (!(BounceFlags & BOUNCE_Quiet))
	{
		if (BounceFlags & BOUNCE_UseSeeSound)
		{
			S_Sound (this, CHAN_VOICE, SeeSound, 1, ATTN_IDLE);
		}
		else if (onfloor || WallBounceSound <= 0)
		{
			S_Sound (this, CHAN_VOICE, BounceSound, 1, ATTN_IDLE);
		}
		else
		{
			S_Sound (this, CHAN_VOICE, WallBounceSound, 1, ATTN_IDLE);
		}
	}
}

//----------------------------------------------------------------------------
//
// PROC P_FloorBounceMissile
//
// Returns true if the missile was destroyed
//----------------------------------------------------------------------------

bool AActor::FloorBounceMissile (secplane_t &plane)
{
	if (z <= floorz && P_HitFloor (this))
	{
		// Landed in some sort of liquid
		if (BounceFlags & BOUNCE_ExplodeOnWater)
		{
			if (flags & MF_MISSILE)
				P_ExplodeMissile(this, NULL, NULL);
			else
				Die(NULL, NULL);
			return true;
		}
		if (!(BounceFlags & BOUNCE_CanBounceWater))
		{
			Destroy ();
			return true;
		}
	}

	if (plane.c < 0)
	{ // on ceiling
		if (!(BounceFlags & BOUNCE_Ceilings))
			return true;
	}
	else
	{ // on floor
		if (!(BounceFlags & BOUNCE_Floors))
			return true;
	}

	// The amount of bounces is limited
	if (bouncecount>0 && --bouncecount==0)
	{
		if (flags & MF_MISSILE)
			P_ExplodeMissile(this, NULL, NULL);
		else
			Die(NULL, NULL);
		return true;
	}

	fixed_t dot = TMulScale16 (velx, plane.a, vely, plane.b, velz, plane.c);

	if (BounceFlags & (BOUNCE_HereticType | BOUNCE_MBF))
	{
		velx -= MulScale15 (plane.a, dot);
		vely -= MulScale15 (plane.b, dot);
		velz -= MulScale15 (plane.c, dot);
		angle = R_PointToAngle2 (0, 0, velx, vely);
		if (!(BounceFlags & BOUNCE_MBF)) // Heretic projectiles die, MBF projectiles don't.
		{
			flags |= MF_INBOUNCE;
			SetState (FindState(NAME_Death));
			flags &= ~MF_INBOUNCE;
			return false;
		}
		else velz = FixedMul(velz, bouncefactor);
	}
	else // Don't run through this for MBF-style bounces
	{
		// The reflected velocity keeps only about 70% of its original speed
		velx = FixedMul (velx - MulScale15 (plane.a, dot), bouncefactor);
		vely = FixedMul (vely - MulScale15 (plane.b, dot), bouncefactor);
		velz = FixedMul (velz - MulScale15 (plane.c, dot), bouncefactor);
		angle = R_PointToAngle2 (0, 0, velx, vely);
	}

	PlayBounceSound(true);
	if (BounceFlags & BOUNCE_MBF) // Bring it to rest below a certain speed
	{
		if (abs(velz) < (fixed_t)(Mass * GetGravity() / 64))
			velz = 0;
	}
	else if (BounceFlags & BOUNCE_AutoOff)
	{
		if (!(flags & MF_NOGRAVITY) && (velz < 3*FRACUNIT))
			BounceFlags &= ~BOUNCE_TypeMask;
	}
	return false;
}

//----------------------------------------------------------------------------
//
// PROC P_ThrustMobj
//
//----------------------------------------------------------------------------

void P_ThrustMobj (AActor *mo, angle_t angle, fixed_t move)
{
	angle >>= ANGLETOFINESHIFT;
	mo->velx += FixedMul (move, finecosine[angle]);
	mo->vely += FixedMul (move, finesine[angle]);
}

//----------------------------------------------------------------------------
//
// FUNC P_FaceMobj
//
// Returns 1 if 'source' needs to turn clockwise, or 0 if 'source' needs
// to turn counter clockwise.  'delta' is set to the amount 'source'
// needs to turn.
//
//----------------------------------------------------------------------------

int P_FaceMobj (AActor *source, AActor *target, angle_t *delta)
{
	angle_t diff;
	angle_t angle1;
	angle_t angle2;

	angle1 = source->angle;
	angle2 = R_PointToAngle2 (source->x, source->y, target->x, target->y);
	if (angle2 > angle1)
	{
		diff = angle2 - angle1;
		if (diff > ANGLE_180)
		{
			*delta = ANGLE_MAX - diff;
			return 0;
		}
		else
		{
			*delta = diff;
			return 1;
		}
	}
	else
	{
		diff = angle1 - angle2;
		if (diff > ANGLE_180)
		{
			*delta = ANGLE_MAX - diff;
			return 1;
		}
		else
		{
			*delta = diff;
			return 0;
		}
	}
}

//----------------------------------------------------------------------------
//
// CanSeek
//
// Checks if a seeker missile can home in on its target
//
//----------------------------------------------------------------------------

bool AActor::CanSeek(AActor *target) const
{
	if (target->flags5 & MF5_CANTSEEK) return false;
	if ((flags2 & MF2_DONTSEEKINVISIBLE) && 
		((target->flags & MF_SHADOW) || 
		 target->renderflags & RF_INVISIBLE || 
		 target->RenderStyle.IsVisible(target->alpha)
		)
	   ) return false;
	return true;
}

//----------------------------------------------------------------------------
//
// FUNC P_SeekerMissile
//
// The missile's tracer field must be the target.  Returns true if
// target was tracked, false if not.
//
//----------------------------------------------------------------------------

bool P_SeekerMissile (AActor *actor, angle_t thresh, angle_t turnMax)
{
	int dir;
	int dist;
	angle_t delta;
	angle_t angle;
	AActor *target;

	target = actor->tracer;
	if (target == NULL || actor->Speed == 0 || !actor->CanSeek(target))
	{
		return false;
	}
	if (!(target->flags & MF_SHOOTABLE))
	{ // Target died
		actor->tracer = NULL;
		return false;
	}
	dir = P_FaceMobj (actor, target, &delta);
	if (delta > thresh)
	{
		delta >>= 1;
		if (delta > turnMax)
		{
			delta = turnMax;
		}
	}
	if (dir)
	{ // Turn clockwise
		actor->angle += delta;
	}
	else
	{ // Turn counter clockwise
		actor->angle -= delta;
	}
	angle = actor->angle>>ANGLETOFINESHIFT;
	actor->velx = FixedMul (actor->Speed, finecosine[angle]);
	actor->vely = FixedMul (actor->Speed, finesine[angle]);

	if (!(actor->flags3 & (MF3_FLOORHUGGER|MF3_CEILINGHUGGER)))
	{
		if (actor->z + actor->height < target->z ||
			target->z + target->height < actor->z)
		{ // Need to seek vertically
			dist = P_AproxDistance (target->x - actor->x, target->y - actor->y);
			dist = dist / actor->Speed;
			if (dist < 1)
			{
				dist = 1;
			}
			actor->velz = ((target->z+target->height/2) - (actor->z+actor->height/2)) / dist;
		}
	}


	return true;
}

//
// P_XYMovement
//
// Returns the actor's old floorz.
//
#define STOPSPEED			0x1000
#define FRICTION			0xe800
#define CARRYSTOPSPEED		(STOPSPEED*32/3)

fixed_t P_XYMovement (AActor *mo, fixed_t scrollx, fixed_t scrolly) 
{
	static int pushtime = 0;
	bool bForceSlide = scrollx || scrolly;
	angle_t angle;
	fixed_t ptryx, ptryy;
	player_t *player;
	fixed_t xmove, ymove;
	const secplane_t * walkplane;
	static const int windTab[3] = {2048*5, 2048*10, 2048*25};
	int steps, step, totalsteps;
	fixed_t startx, starty;
	fixed_t oldfloorz = mo->floorz;

	fixed_t maxmove = (mo->waterlevel < 1) || (mo->flags & MF_MISSILE) || 
					  (mo->player && mo->player->crouchoffset<-10*FRACUNIT) ? MAXMOVE : MAXMOVE/4;

	if (mo->flags2 & MF2_WINDTHRUST && mo->waterlevel < 2 && !(mo->flags & MF_NOCLIP))
	{
		int special = mo->Sector->special;
		switch (special)
		{
			case 40: case 41: case 42: // Wind_East
				P_ThrustMobj (mo, 0, windTab[special-40]);
				break;
			case 43: case 44: case 45: // Wind_North
				P_ThrustMobj (mo, ANG90, windTab[special-43]);
				break;
			case 46: case 47: case 48: // Wind_South
				P_ThrustMobj (mo, ANG270, windTab[special-46]);
				break;
			case 49: case 50: case 51: // Wind_West
				P_ThrustMobj (mo, ANG180, windTab[special-49]);
				break;
		}
	}

	// [RH] No need to clamp these now. However, wall running needs it so
	// that large thrusts can't propel an actor through a wall, because wall
	// running depends on the player's original movement continuing even after
	// it gets blocked.
	if ((mo->player != NULL && (i_compatflags & COMPATF_WALLRUN)) || (mo->waterlevel >= 1) ||
		(mo->player != NULL && mo->player->crouchfactor < FRACUNIT*3/4))
	{
		// preserve the direction instead of clamping x and y independently.
		xmove = clamp (mo->velx, -maxmove, maxmove);
		ymove = clamp (mo->vely, -maxmove, maxmove);

		fixed_t xfac = FixedDiv(xmove, mo->velx);
		fixed_t yfac = FixedDiv(ymove, mo->vely);
		fixed_t fac = MIN(xfac, yfac);

		xmove = mo->velx = FixedMul(mo->velx, fac);
		ymove = mo->vely = FixedMul(mo->vely, fac);
	}
	else
	{
		xmove = mo->velx;
		ymove = mo->vely;
	}
	// [RH] Carrying sectors didn't work with low speeds in BOOM. This is
	// because BOOM relied on the speed being fast enough to accumulate
	// despite friction. If the speed is too low, then its movement will get
	// cancelled, and it won't accumulate to the desired speed.
	mo->flags4 &= ~MF4_SCROLLMOVE;
	if (abs(scrollx) > CARRYSTOPSPEED)
	{
		scrollx = FixedMul (scrollx, CARRYFACTOR);
		mo->velx += scrollx;
		mo->flags4 |= MF4_SCROLLMOVE;
	}
	if (abs(scrolly) > CARRYSTOPSPEED)
	{
		scrolly = FixedMul (scrolly, CARRYFACTOR);
		mo->vely += scrolly;
		mo->flags4 |= MF4_SCROLLMOVE;
	}
	xmove += scrollx;
	ymove += scrolly;

	if ((xmove | ymove) == 0)
	{
		if (mo->flags & MF_SKULLFLY)
		{
			// the skull slammed into something
			mo->flags &= ~MF_SKULLFLY;
			mo->velx = mo->vely = mo->velz = 0;
			if (!(mo->flags2 & MF2_DORMANT))
			{
				if (mo->SeeState != NULL) mo->SetState (mo->SeeState);
				else mo->SetIdle();
			}
			else
			{
				mo->SetIdle();
				mo->tics = -1;
			}
		}
		return oldfloorz;
	}

	player = mo->player;

	// [RH] Adjust player movement on sloped floors
	fixed_t startxmove = xmove;
	fixed_t startymove = ymove;
	walkplane = P_CheckSlopeWalk (mo, xmove, ymove);

	// [RH] Take smaller steps when moving faster than the object's size permits.
	// Moving as fast as the object's "diameter" is bad because it could skip
	// some lines because the actor could land such that it is just touching the
	// line. For Doom to detect that the line is there, it needs to actually cut
	// through the actor.

	{
		maxmove = mo->radius - FRACUNIT;

		if (maxmove <= 0)
		{ // gibs can have radius 0, so don't divide by zero below!
			maxmove = MAXMOVE;
		}

		const fixed_t xspeed = abs (xmove);
		const fixed_t yspeed = abs (ymove);

		steps = 1;

		if (xspeed > yspeed)
		{
			if (xspeed > maxmove)
			{
				steps = 1 + xspeed / maxmove;
			}
		}
		else
		{
			if (yspeed > maxmove)
			{
				steps = 1 + yspeed / maxmove;
			}
		}
	}

	// P_SlideMove needs to know the step size before P_CheckSlopeWalk
	// because it also calls P_CheckSlopeWalk on its clipped steps.
	fixed_t onestepx = startxmove / steps;
	fixed_t onestepy = startymove / steps;

	startx = mo->x;
	starty = mo->y;
	step = 1;
	totalsteps = steps;

	// [RH] Instead of doing ripping damage each step, do it each tic.
	// This makes it compatible with Heretic and Hexen, which only did
	// one step for their missiles with ripping damage (excluding those
	// that don't use P_XYMovement). It's also more intuitive since it
	// makes the damage done dependant on the amount of time the projectile
	// spends inside a target rather than on the projectile's size. The
	// last actor ripped through is recorded so that if the projectile
	// passes through more than one actor this tic, each one takes damage
	// and not just the first one.
	pushtime++;

	FCheckPosition tm(!!(mo->flags2 & MF2_RIP));


	do
	{
		if (i_compatflags & COMPATF_WALLRUN) pushtime++;
		tm.PushTime = pushtime;

		ptryx = startx + Scale (xmove, step, steps);
		ptryy = starty + Scale (ymove, step, steps);

/*		if (mo->player)
		Printf ("%d,%d/%d: %d %d %d %d %d %d %d\n", level.time, step, steps, startxmove, Scale(xmove,step,steps), startymove, Scale(ymove,step,steps), mo->x, mo->y, mo->z);
*/
		// [RH] If walking on a slope, stay on the slope
		// killough 3/15/98: Allow objects to drop off
		fixed_t startvelx = mo->velx, startvely = mo->vely;

		if (!P_TryMove (mo, ptryx, ptryy, true, walkplane, tm))
		{
			// blocked move
			AActor *BlockingMobj = mo->BlockingMobj;
			line_t *BlockingLine = mo->BlockingLine;

			if (!(mo->flags & MF_MISSILE) && (mo->BounceFlags & BOUNCE_MBF) 
				&& (BlockingMobj != NULL ? P_BounceActor(mo, BlockingMobj) : P_BounceWall(mo)))
			{
				// Do nothing, relevant actions already done in the condition.
				// This allows to avoid setting velocities to 0 in the final else of this series.
			}
			else if ((mo->flags2 & (MF2_SLIDE|MF2_BLASTED) || bForceSlide) && !(mo->flags&MF_MISSILE))
			{	// try to slide along it
				if (BlockingMobj == NULL)
				{ // slide against wall
					if (BlockingLine != NULL &&
						mo->player && mo->waterlevel && mo->waterlevel < 3 &&
						(mo->player->cmd.ucmd.forwardmove | mo->player->cmd.ucmd.sidemove) &&
						mo->BlockingLine->sidedef[1] != NULL)
					{
						mo->velz = WATER_JUMP_SPEED;
					}
					// If the blocked move executed any push specials that changed the
					// actor's velocity, do not attempt to slide.
					if (mo->velx == startvelx && mo->vely == startvely)
					{
						if (player && (i_compatflags & COMPATF_WALLRUN))
						{
						// [RH] Here is the key to wall running: The move is clipped using its full speed.
						// If the move is done a second time (because it was too fast for one move), it
						// is still clipped against the wall at its full speed, so you effectively
						// execute two moves in one tic.
							P_SlideMove (mo, mo->velx, mo->vely, 1);
						}
						else
						{
							P_SlideMove (mo, onestepx, onestepy, totalsteps);
						}
						if ((mo->velx | mo->vely) == 0)
						{
							steps = 0;
						}
						else
						{
							if (!player || !(i_compatflags & COMPATF_WALLRUN))
							{
								xmove = mo->velx;
								ymove = mo->vely;
								onestepx = xmove / steps;
								onestepy = ymove / steps;
								P_CheckSlopeWalk (mo, xmove, ymove);
							}
							startx = mo->x - Scale (xmove, step, steps);
							starty = mo->y - Scale (ymove, step, steps);
						}
					}
					else
					{
						steps = 0;
					}
				}
				else
				{ // slide against another actor
					fixed_t tx, ty;
					tx = 0, ty = onestepy;
					walkplane = P_CheckSlopeWalk (mo, tx, ty);
					if (P_TryMove (mo, mo->x + tx, mo->y + ty, true, walkplane, tm))
					{
						mo->velx = 0;
					}
					else
					{
						tx = onestepx, ty = 0;
						walkplane = P_CheckSlopeWalk (mo, tx, ty);
						if (P_TryMove (mo, mo->x + tx, mo->y + ty, true, walkplane, tm))
						{
							mo->vely = 0;
						}
						else
						{
							mo->velx = mo->vely = 0;
						}
					}
					if (player && player->mo == mo)
					{
						if (mo->velx == 0)
							player->velx = 0;
						if (mo->vely == 0)
							player->vely = 0;
					}
					steps = 0;
				}
			}
			else if (mo->flags & MF_MISSILE)
			{
				steps = 0;
				if (BlockingMobj)
				{
					if (mo->BounceFlags & BOUNCE_Actors)
					{
						// Bounce test and code moved to P_BounceActor
						if (!P_BounceActor(mo, BlockingMobj))
						{	// Struck a player/creature
							P_ExplodeMissile (mo, NULL, BlockingMobj);
						}
						return oldfloorz;
					}
				}
				else
				{
					// Struck a wall
					if (P_BounceWall (mo))
					{
						mo->PlayBounceSound(false);
						return oldfloorz;
					}
				}
				if (BlockingMobj && (BlockingMobj->flags2 & MF2_REFLECTIVE))
				{
					angle = R_PointToAngle2(BlockingMobj->x, BlockingMobj->y, mo->x, mo->y);

					// Change angle for deflection/reflection
					if (mo->AdjustReflectionAngle (BlockingMobj, angle))
					{
						goto explode;
					}

					// Reflect the missile along angle
					mo->angle = angle;
					angle >>= ANGLETOFINESHIFT;
					mo->velx = FixedMul (mo->Speed>>1, finecosine[angle]);
					mo->vely = FixedMul (mo->Speed>>1, finesine[angle]);
					mo->velz = -mo->velz/2;
					if (mo->flags2 & MF2_SEEKERMISSILE)
					{
						mo->tracer = mo->target;
					}
					mo->target = BlockingMobj;
					return oldfloorz;
				}
explode:
				// explode a missile
				if (tm.ceilingline &&
					tm.ceilingline->backsector &&
					tm.ceilingline->backsector->GetTexture(sector_t::ceiling) == skyflatnum &&
					mo->z >= tm.ceilingline->backsector->ceilingplane.ZatPoint (mo->x, mo->y) && //killough
					!(mo->flags3 & MF3_SKYEXPLODE))
				{
					// Hack to prevent missiles exploding against the sky.
					// Does not handle sky floors.
					mo->Destroy ();
					return oldfloorz;
				}
				// [RH] Don't explode on horizon lines.
				if (mo->BlockingLine != NULL && mo->BlockingLine->special == Line_Horizon)
				{
					mo->Destroy ();
					return oldfloorz;
				}
				P_ExplodeMissile (mo, mo->BlockingLine, BlockingMobj);
				return oldfloorz;
			}
			else
			{
				mo->velx = mo->vely = 0;
				steps = 0;
			}
		}
		else
		{
			if (mo->x != ptryx || mo->y != ptryy)
			{
				// If the new position does not match the desired position, the player
				// must have gone through a teleporter, so stop moving right now if it
				// was a regular teleporter. If it was a line-to-line or fogless teleporter,
				// the move should continue, but startx and starty need to change.
				if (mo->velx == 0 && mo->vely == 0)
				{
					step = steps;
				}
				else
				{
					startx = mo->x - Scale (xmove, step, steps);
					starty = mo->y - Scale (ymove, step, steps);
				}
			}
		}
	} while (++step <= steps);

	// Friction

	if (player && player->mo == mo && player->cheats & CF_NOVELOCITY)
	{ // debug option for no sliding at all
		mo->velx = mo->vely = 0;
		player->velx = player->vely = 0;
		return oldfloorz;
	}

	if (mo->flags & (MF_MISSILE | MF_SKULLFLY))
	{ // no friction for missiles
		return oldfloorz;
	}

	if (mo->z > mo->floorz && !(mo->flags2 & MF2_ONMOBJ) &&
		(!(mo->flags2 & MF2_FLY) || !(mo->flags & MF_NOGRAVITY)) && !mo->waterlevel)
	{ // [RH] Friction when falling is available for larger aircontrols
		if (player != NULL && level.airfriction != FRACUNIT)
		{
			mo->velx = FixedMul (mo->velx, level.airfriction);
			mo->vely = FixedMul (mo->vely, level.airfriction);

			if (player->mo == mo)		//  Not voodoo dolls
			{
				player->velx = FixedMul (player->velx, level.airfriction);
				player->vely = FixedMul (player->vely, level.airfriction);
			}
		}
		return oldfloorz;
	}

	// killough 8/11/98: add bouncers
	// killough 9/15/98: add objects falling off ledges
	// killough 11/98: only include bouncers hanging off ledges
	if ((mo->flags & MF_CORPSE) || (mo->BounceFlags & BOUNCE_MBF && mo->z > mo->dropoffz) || (mo->flags6 & MF6_FALLING))
	{ // Don't stop sliding if halfway off a step with some velocity
		if (mo->velx > FRACUNIT/4 || mo->velx < -FRACUNIT/4 || mo->vely > FRACUNIT/4 || mo->vely < -FRACUNIT/4)
		{
			if (mo->floorz > mo->Sector->floorplane.ZatPoint (mo->x, mo->y))
			{
				if (mo->dropoffz != mo->floorz) // 3DMidtex or other special cases that must be excluded
				{
#ifdef _3DFLOORS
					unsigned i;
					for(i=0;i<mo->Sector->e->XFloor.ffloors.Size();i++)
					{
						// Sliding around on 3D floors looks extremely bad so
						// if the floor comes from one in the current sector stop sliding the corpse!
						F3DFloor * rover=mo->Sector->e->XFloor.ffloors[i];
						if (!(rover->flags&FF_EXISTS)) continue;
						if (rover->flags&FF_SOLID && rover->top.plane->ZatPoint(mo->x,mo->y)==mo->floorz) break;
					}
					if (i==mo->Sector->e->XFloor.ffloors.Size()) 
#endif
						return oldfloorz;
				}
			}
		}
	}

	// killough 11/98:
	// Stop voodoo dolls that have come to rest, despite any
	// moving corresponding player:
	if (mo->velx > -STOPSPEED && mo->velx < STOPSPEED
		&& mo->vely > -STOPSPEED && mo->vely < STOPSPEED
		&& (!player || (player->mo != mo)
			|| !(player->cmd.ucmd.forwardmove | player->cmd.ucmd.sidemove)))
	{
		// if in a walking frame, stop moving
		// killough 10/98:
		// Don't affect main player when voodoo dolls stop:
		if (player && player->mo == mo && !(player->cheats & CF_PREDICTING))
		{
			player->mo->PlayIdle ();
		}

		mo->velx = mo->vely = 0;
		mo->flags4 &= ~MF4_SCROLLMOVE;

		// killough 10/98: kill any bobbing velocity too (except in voodoo dolls)
		if (player && player->mo == mo)
			player->velx = player->vely = 0; 
	}
	else
	{
		// phares 3/17/98
		// Friction will have been adjusted by friction thinkers for icy
		// or muddy floors. Otherwise it was never touched and
		// remained set at ORIG_FRICTION
		//
		// killough 8/28/98: removed inefficient thinker algorithm,
		// instead using touching_sectorlist in P_GetFriction() to
		// determine friction (and thus only when it is needed).
		//
		// killough 10/98: changed to work with new bobbing method.
		// Reducing player velocity is no longer needed to reduce
		// bobbing, so ice works much better now.

		fixed_t friction = P_GetFriction (mo, NULL);

		mo->velx = FixedMul (mo->velx, friction);
		mo->vely = FixedMul (mo->vely, friction);

		// killough 10/98: Always decrease player bobbing by ORIG_FRICTION.
		// This prevents problems with bobbing on ice, where it was not being
		// reduced fast enough, leading to all sorts of kludges being developed.

		if (player && player->mo == mo)		//  Not voodoo dolls
		{
			player->velx = FixedMul (player->velx, ORIG_FRICTION);
			player->vely = FixedMul (player->vely, ORIG_FRICTION);
		}
	}
	return oldfloorz;
}

// Move this to p_inter ***
void P_MonsterFallingDamage (AActor *mo)
{
	int damage;
	int vel;

	if (!(level.flags2 & LEVEL2_MONSTERFALLINGDAMAGE))
		return;
	if (mo->floorsector->Flags & SECF_NOFALLINGDAMAGE)
		return;

	vel = abs(mo->velz);
	if (vel > 35*FRACUNIT)
	{ // automatic death
		damage = TELEFRAG_DAMAGE;
	}
	else
	{
		damage = ((vel - (23*FRACUNIT))*6)>>FRACBITS;
	}
	damage = TELEFRAG_DAMAGE;	// always kill 'em
	P_DamageMobj (mo, NULL, NULL, damage, NAME_Falling);
}

//
// P_ZMovement
//

void P_ZMovement (AActor *mo, fixed_t oldfloorz)
{
	fixed_t dist;
	fixed_t delta;
	fixed_t oldz = mo->z;	
	
//	
// check for smooth step up
//
	if (mo->player && mo->player->mo == mo && mo->z < mo->floorz)
	{
		mo->player->viewheight -= mo->floorz - mo->z;
		mo->player->deltaviewheight = mo->player->GetDeltaViewHeight();
	}

	if (!(mo->flags2 & MF2_FLOATBOB))
	{
		mo->z += mo->velz;
	}

//
// apply gravity
//
	if (mo->z > mo->floorz && !(mo->flags & MF_NOGRAVITY))
	{
		fixed_t startvelz = mo->velz;

		if (!mo->waterlevel || mo->flags & MF_CORPSE || (mo->player &&
			!(mo->player->cmd.ucmd.forwardmove | mo->player->cmd.ucmd.sidemove)))
		{
			fixed_t grav = mo->GetGravity();

			// [RH] Double gravity only if running off a ledge. Coming down from
			// an upward thrust (e.g. a jump) should not double it.
			if (mo->velz == 0 && oldfloorz > mo->floorz && mo->z == oldfloorz)
			{
				mo->velz -= grav + grav;
			}
			else
			{
				mo->velz -= grav;
			}
		}
		if (mo->waterlevel > 1)
		{
			fixed_t sinkspeed = mo->flags & MF_CORPSE ? -WATER_SINK_SPEED/3 : -WATER_SINK_SPEED;

			if (mo->velz < sinkspeed)
			{
				mo->velz = (startvelz < sinkspeed) ? startvelz : sinkspeed;
			}
			else
			{
				mo->velz = startvelz + ((mo->velz - startvelz) >>
					(mo->waterlevel == 1 ? WATER_SINK_SMALL_FACTOR : WATER_SINK_FACTOR));
			}
		}
	}

	if (mo->flags2 & MF2_FLOATBOB)
	{
		mo->z += mo->velz;
	}

//
// adjust height
//
	if ((mo->flags & MF_FLOAT) && !(mo->flags2 & MF2_DORMANT) && mo->target)
	{	// float down towards target if too close
		if (!(mo->flags & (MF_SKULLFLY | MF_INFLOAT)))
		{
			dist = P_AproxDistance (mo->x - mo->target->x, mo->y - mo->target->y);
			delta = (mo->target->z + (mo->height>>1)) - mo->z;
			if (delta < 0 && dist < -(delta*3))
				mo->z -= mo->FloatSpeed, mo->velz = 0;
			else if (delta > 0 && dist < (delta*3))
				mo->z += mo->FloatSpeed, mo->velz = 0;
		}
	}
	if (mo->player && (mo->flags & MF_NOGRAVITY) && (mo->z > mo->floorz))
	{
		mo->z += finesine[(FINEANGLES/80*level.maptime)&FINEMASK]/8;
		mo->velz = FixedMul (mo->velz, FRICTION_FLY);
	}
	if (mo->waterlevel && !(mo->flags & MF_NOGRAVITY))
	{
		mo->velz = FixedMul (mo->velz, mo->Sector->friction);
	}

//
// clip movement
//
	if (mo->z <= mo->floorz)
	{	// Hit the floor
		if ((!mo->player || !(mo->player->cheats & CF_PREDICTING)) &&
			mo->Sector->SecActTarget != NULL &&
			mo->Sector->floorplane.ZatPoint (mo->x, mo->y) == mo->floorz)
		{ // [RH] Let the sector do something to the actor
			mo->Sector->SecActTarget->TriggerAction (mo, SECSPAC_HitFloor);
		}
		P_CheckFor3DFloorHit(mo);
		// [RH] Need to recheck this because the sector action might have
		// teleported the actor so it is no longer below the floor.
		if (mo->z <= mo->floorz)
		{
			// old code for boss cube disabled
			//if ((mo->flags & MF_MISSILE) && (!(gameinfo.gametype & GAME_DoomChex) || !(mo->flags & MF_NOCLIP)))

			if (mo->flags & MF_MISSILE)
			{
				mo->z = mo->floorz;
				if (mo->BounceFlags & BOUNCE_Floors)
				{
					mo->FloorBounceMissile (mo->floorsector->floorplane);
					/* if (!(mo->flags6 & MF6_CANJUMP)) */ return;
				}
				else if (mo->flags3 & MF3_NOEXPLODEFLOOR)
				{
					P_HitFloor (mo);
					mo->velz = 0;
					return;
				}
				else if (mo->flags3 & MF3_FLOORHUGGER)
				{ // Floor huggers can go up steps
					return;
				}
				else
				{
					if (mo->floorpic == skyflatnum && !(mo->flags3 & MF3_SKYEXPLODE))
					{
						// [RH] Just remove the missile without exploding it
						//		if this is a sky floor.
						mo->Destroy ();
						return;
					}
					P_HitFloor (mo);
					P_ExplodeMissile (mo, NULL, NULL);
					return;
				}
			}
			else if (mo->BounceFlags & BOUNCE_MBF && mo->velz) // check for MBF-like bounce on non-missiles
			{
				mo->FloorBounceMissile(mo->floorsector->floorplane);
			}
			if (mo->flags3 & MF3_ISMONSTER)		// Blasted mobj falling
			{
				if (mo->velz < -(23*FRACUNIT))
				{
					P_MonsterFallingDamage (mo);
				}
			}
			mo->z = mo->floorz;
			if (mo->velz < 0)
			{
				const fixed_t minvel = -9*FRACUNIT;	// landing speed from a jump with normal gravity

				// Spawn splashes, etc.
				P_HitFloor (mo);
				if (mo->DamageType == NAME_Ice && mo->velz < minvel)
				{
					mo->tics = 1;
					mo->velx = 0;
					mo->vely = 0;
					mo->velz = 0;
					return;
				}
				// Let the actor do something special for hitting the floor
				mo->HitFloor ();
				if (mo->player)
				{
					mo->player->jumpTics = 7;	// delay any jumping for a short while
					if (mo->velz < minvel && !(mo->flags & MF_NOGRAVITY))
					{
						// Squat down.
						// Decrease viewheight for a moment after hitting the ground (hard),
						// and utter appropriate sound.
						PlayerLandedOnThing (mo, NULL);
					}
				}
				mo->velz = 0;
			}
			if (mo->flags & MF_SKULLFLY)
			{ // The skull slammed into something
				mo->velz = -mo->velz;
			}
			mo->Crash();
		}
	}

	if (mo->flags2 & MF2_FLOORCLIP)
	{
		mo->AdjustFloorClip ();
	}

	if (mo->z + mo->height > mo->ceilingz)
	{ // hit the ceiling
		if ((!mo->player || !(mo->player->cheats & CF_PREDICTING)) &&
			mo->Sector->SecActTarget != NULL &&
			mo->Sector->ceilingplane.ZatPoint (mo->x, mo->y) == mo->ceilingz)
		{ // [RH] Let the sector do something to the actor
			mo->Sector->SecActTarget->TriggerAction (mo, SECSPAC_HitCeiling);
		}
		P_CheckFor3DCeilingHit(mo);
		// [RH] Need to recheck this because the sector action might have
		// teleported the actor so it is no longer above the ceiling.
		if (mo->z + mo->height > mo->ceilingz)
		{
			mo->z = mo->ceilingz - mo->height;
			if (mo->BounceFlags & BOUNCE_Ceilings)
			{	// ceiling bounce
				mo->FloorBounceMissile (mo->ceilingsector->ceilingplane);
				/*if (!(mo->flags6 & MF6_CANJUMP))*/ return;
			}
			if (mo->flags & MF_SKULLFLY)
			{	// the skull slammed into something
				mo->velz = -mo->velz;
			}
			if (mo->velz > 0)
				mo->velz = 0;
			if (mo->flags & MF_MISSILE)
				//&& (!(gameinfo.gametype & GAME_DoomChex) || !(mo->flags & MF_NOCLIP)))
			{
				if (mo->flags3 & MF3_CEILINGHUGGER)
				{
					return;
				}
				if (mo->ceilingpic == skyflatnum &&  !(mo->flags3 & MF3_SKYEXPLODE))
				{
					mo->Destroy ();
					return;
				}
				P_ExplodeMissile (mo, NULL, NULL);
				return;
			}
		}
	}
	P_CheckFakeFloorTriggers (mo, oldz);
}

void P_CheckFakeFloorTriggers (AActor *mo, fixed_t oldz, bool oldz_has_viewheight)
{
	if (mo->player && (mo->player->cheats & CF_PREDICTING))
	{
		return;
	}
	sector_t *sec = mo->Sector;
	assert (sec != NULL);
	if (sec == NULL)
	{
		return;
	}
	if (sec->heightsec != NULL && sec->SecActTarget != NULL)
	{
		sector_t *hs = sec->heightsec;
		fixed_t waterz = hs->floorplane.ZatPoint (mo->x, mo->y);
		fixed_t newz;
		fixed_t viewheight;

		if (mo->player != NULL)
		{
			viewheight = mo->player->viewheight;
		}
		else
		{
			viewheight = mo->height / 2;
		}

		if (oldz > waterz && mo->z <= waterz)
		{ // Feet hit fake floor
			sec->SecActTarget->TriggerAction (mo, SECSPAC_HitFakeFloor);
		}

		newz = mo->z + viewheight;
		if (!oldz_has_viewheight)
		{
			oldz += viewheight;
		}

		if (oldz <= waterz && newz > waterz)
		{ // View went above fake floor
			sec->SecActTarget->TriggerAction (mo, SECSPAC_EyesSurface);
		}
		else if (oldz > waterz && newz <= waterz)
		{ // View went below fake floor
			sec->SecActTarget->TriggerAction (mo, SECSPAC_EyesDive);
		}

		if (!(hs->MoreFlags & SECF_FAKEFLOORONLY))
		{
			waterz = hs->ceilingplane.ZatPoint (mo->x, mo->y);
			if (oldz <= waterz && newz > waterz)
			{ // View went above fake ceiling
				sec->SecActTarget->TriggerAction (mo, SECSPAC_EyesAboveC);
			}
			else if (oldz > waterz && newz <= waterz)
			{ // View went below fake ceiling
				sec->SecActTarget->TriggerAction (mo, SECSPAC_EyesBelowC);
			}
		}
	}
}

//===========================================================================
//
// PlayerLandedOnThing
//
//===========================================================================

static void PlayerLandedOnThing (AActor *mo, AActor *onmobj)
{
	bool grunted;

	if (!mo->player)
		return;

	if (mo->player->mo == mo)
	{
		mo->player->deltaviewheight = mo->velz >> 3;
	}

	if (mo->player->cheats & CF_PREDICTING)
		return;

	P_FallingDamage (mo);

	// [RH] only make noise if alive
	if (!mo->player->morphTics && mo->health > 0)
	{
		grunted = false;
		// Why should this number vary by gravity?
		if (mo->velz < (fixed_t)(800.f /*level.gravity * mo->Sector->gravity*/ * -983.04f) && mo->health > 0)
		{
			S_Sound (mo, CHAN_VOICE, "*grunt", 1, ATTN_NORM);
			grunted = true;
		}
		if (onmobj != NULL || !Terrains[P_GetThingFloorType (mo)].IsLiquid)
		{
			if (!grunted || !S_AreSoundsEquivalent (mo, "*grunt", "*land"))
			{
				S_Sound (mo, CHAN_AUTO, "*land", 1, ATTN_NORM);
			}
		}
	}
//	mo->player->centering = true;
}



//
// P_NightmareRespawn
//
void P_NightmareRespawn (AActor *mobj)
{
	fixed_t x, y, z;
	AActor *mo;
	AActor *info = mobj->GetDefault();

	mobj->skillrespawncount++;

	// spawn the new monster (assume the spawn will be good)
	if (info->flags & MF_SPAWNCEILING)
		z = ONCEILINGZ;
	else if (info->flags2 & MF2_SPAWNFLOAT)
		z = FLOATRANDZ;
	else if (info->flags2 & MF2_FLOATBOB)
		z = mobj->SpawnPoint[2];
	else
		z = ONFLOORZ;

	// spawn it
	x = mobj->SpawnPoint[0];
	y = mobj->SpawnPoint[1];
	mo = Spawn (RUNTIME_TYPE(mobj), x, y, z, NO_REPLACE);

	if (z == ONFLOORZ)
		mo->z += mo->SpawnPoint[2];
	else if (z == ONCEILINGZ)
		mo->z -= mo->SpawnPoint[2];

	// something is occupying its position?
	if (!P_TestMobjLocation (mo))
	{
		//[GrafZahl] MF_COUNTKILL still needs to be checked here.
		if (mo->CountsAsKill()) level.total_monsters--;
		mo->Destroy ();
		return;		// no respawn
	}

	z = mo->z;

	// inherit attributes from deceased one
	mo->SpawnPoint[0] = mobj->SpawnPoint[0];
	mo->SpawnPoint[1] = mobj->SpawnPoint[1];
	mo->SpawnPoint[2] = mobj->SpawnPoint[2];
	mo->SpawnAngle = mobj->SpawnAngle;
	mo->SpawnFlags = mobj->SpawnFlags & ~MTF_DORMANT;	// It wasn't dormant when it died, so it's not dormant now, either.
	mo->angle = ANG45 * (mobj->SpawnAngle/45);

	mo->HandleSpawnFlags ();
	mo->reactiontime = 18;
	mo->CopyFriendliness (mobj, false);
	mo->Translation = mobj->Translation;

	mo->skillrespawncount = mobj->skillrespawncount;

	// spawn a teleport fog at old spot because of removal of the body?
	mo = Spawn ("TeleportFog", mobj->x, mobj->y, mobj->z, ALLOW_REPLACE);
	if (mo != NULL)
	{
		mo->z += TELEFOGHEIGHT;
	}

	// spawn a teleport fog at the new spot
	mo = Spawn ("TeleportFog", x, y, z, ALLOW_REPLACE);
	if (mo != NULL)
	{
		mo->z += TELEFOGHEIGHT;
	}

	// remove the old monster
	mobj->Destroy ();
}


AActor *AActor::TIDHash[128];

//
// P_ClearTidHashes
//
// Clears the tid hashtable.
//

void AActor::ClearTIDHashes ()
{
	int i;

	for (i = 0; i < 128; i++)
		TIDHash[i] = NULL;
}

//
// P_AddMobjToHash
//
// Inserts an mobj into the correct chain based on its tid.
// If its tid is 0, this function does nothing.
//
void AActor::AddToHash ()
{
	if (tid == 0)
	{
		iprev = NULL;
		inext = NULL;
		return;
	}
	else
	{
		int hash = TIDHASH (tid);

		inext = TIDHash[hash];
		iprev = &TIDHash[hash];
		TIDHash[hash] = this;
		if (inext)
		{
			inext->iprev = &inext;
		}
	}
}

//
// P_RemoveMobjFromHash
//
// Removes an mobj from its hash chain.
//
void AActor::RemoveFromHash ()
{
	if (tid != 0 && iprev)
	{
		*iprev = inext;
		if (inext)
		{
			inext->iprev = iprev;
		}
		iprev = NULL;
		inext = NULL;
	}
	tid = 0;
}

angle_t AActor::AngleIncrements ()
{
	return ANGLE_45;
}

//==========================================================================
//
// AActor :: GetMissileDamage
//
// If the actor's damage amount is an expression, evaluate it and return
// the result. Otherwise, return ((random() & mask) + add) * damage.
//
//==========================================================================

int AActor::GetMissileDamage (int mask, int add)
{
	if ((Damage & 0xC0000000) == 0x40000000)
	{
		return EvalExpressionI (Damage & 0x3FFFFFFF, this);
	}
	if (Damage == 0)
	{
		return 0;
	}
	else if (mask == 0)
	{
		return add * Damage;
	}
	else
	{
		return ((pr_missiledamage() & mask) + add) * Damage;
	}
}

void AActor::Howl ()
{
	int howl = GetClass()->Meta.GetMetaInt(AMETA_HowlSound);
	if (!S_IsActorPlayingSomething(this, CHAN_BODY, howl))
	{
		S_Sound (this, CHAN_BODY, howl, 1, ATTN_NORM);
	}
}

void AActor::HitFloor ()
{
}

bool AActor::Slam (AActor *thing)
{
	flags &= ~MF_SKULLFLY;
	velx = vely = velz = 0;
	if (health > 0)
	{
		if (!(flags2 & MF2_DORMANT))
		{
			int dam = GetMissileDamage (7, 1);
			P_DamageMobj (thing, this, this, dam, NAME_Melee);
			P_TraceBleed (dam, thing, this);
			if (SeeState != NULL) SetState (SeeState);
			else SetIdle();
		}
		else
		{
			SetIdle();
			tics = -1;
		}
	}
	return false;			// stop moving
}

bool AActor::SpecialBlastHandling (AActor *source, fixed_t strength)
{
	return true;
}

int AActor::SpecialMissileHit (AActor *victim)
{
	return -1;
}

bool AActor::AdjustReflectionAngle (AActor *thing, angle_t &angle)
{
	if (flags2 & MF2_DONTREFLECT) return true;

	// Change angle for reflection
	if (thing->flags4&MF4_SHIELDREFLECT)
	{
		// Shield reflection (from the Centaur
		if (abs (angle - thing->angle)>>24 > 45)
			return true;	// Let missile explode

		if (thing->IsKindOf (RUNTIME_CLASS(AHolySpirit)))	// shouldn't this be handled by another flag???
			return true;

		if (pr_reflect () < 128)
			angle += ANGLE_45;
		else
			angle -= ANGLE_45;

	}
	else if (thing->flags4&MF4_DEFLECT)
	{
		// deflect (like the Heresiarch)
		if(pr_reflect() < 128) 
			angle += ANG45;
		else 
			angle -= ANG45;
	}
	else 
		angle += ANGLE_1 * ((pr_reflect()%16)-8);
	return false;
}

void AActor::PlayActiveSound ()
{
	if (ActiveSound && !S_IsActorPlayingSomething (this, CHAN_VOICE, -1))
	{
		S_Sound (this, CHAN_VOICE, ActiveSound, 1,
			(flags3 & MF3_FULLVOLACTIVE) ? ATTN_NONE : ATTN_IDLE);
	}
}

bool AActor::IsOkayToAttack (AActor *link)
{
	if (!(player							// Original AActor::IsOkayToAttack was only for players
	//	|| (flags  & MF_FRIENDLY)			// Maybe let friendly monsters use the function as well?
		|| (flags5 & MF5_SUMMONEDMONSTER)	// AMinotaurFriend has its own version, generalized to other summoned monsters
		|| (flags2 & MF2_SEEKERMISSILE)))	// AHolySpirit and AMageStaffFX2 as well, generalized to other seeker missiles
	{	// Normal monsters and other actors always return false.
		return false;
	}
	// Standard things to eliminate: an actor shouldn't attack itself,
	// or a non-shootable, dormant, non-player-and-non-monster actor.
	if (link == this)									return false;
	if (!(link->player||(link->flags3 & MF3_ISMONSTER)))return false;
	if (!(link->flags & MF_SHOOTABLE))					return false;
	if (link->flags2 & MF2_DORMANT)						return false;

	// An actor shouldn't attack friendly actors. The reference depends
	// on the type of actor: for a player's actor, itself; for a projectile,
	// its target; and for a summoned minion, its tracer.
	AActor * Friend = NULL;
	if (player)											Friend = this;
	else if (flags5 & MF5_SUMMONEDMONSTER)				Friend = tracer;
	else if (flags2 & MF2_SEEKERMISSILE)				Friend = target;
	else if ((flags & MF_FRIENDLY) && FriendPlayer)		Friend = players[FriendPlayer-1].mo;

	// Friend checks
	if (link == Friend)									return false;
	if (Friend == NULL)									return false;
	if (Friend->IsFriend(link))							return false;
	if ((link->flags5 & MF5_SUMMONEDMONSTER)			// No attack against minions on the same side
		&& (link->tracer == Friend))					return false;
	if (multiplayer && !deathmatch						// No attack against fellow players in coop
		&& link->player && Friend->player)				return false;
	if (((flags & link->flags) & MF_FRIENDLY)			// No friendly infighting amongst minions
		&& IsFriend(link))								return false;

	// Now that all the actor checks are made, the line of sight can be checked
	if (P_CheckSight (this, link))
	{
		// AMageStaffFX2::IsOkayToAttack had an extra check here, generalized with a flag,
		// to only allow the check to succeed if the enemy was in a ~84<38> FOV of the player
		if (flags3 & MF3_SCREENSEEKER)
		{
			angle_t angle = R_PointToAngle2(Friend->x, 
				Friend->y, link->x, link->y) - Friend->angle;
			angle >>= 24;
			if (angle>226 || angle<30)
			{
				return true;
			}
		}
		// Other actors are not concerned by this check
		else return true;
	}
	// The sight check was failed, or the angle wasn't right for a screenseeker
	return false;
}

void AActor::SetShade (DWORD rgb)
{
	PalEntry *entry = (PalEntry *)&rgb;
	fillcolor = rgb | (ColorMatcher.Pick (entry->r, entry->g, entry->b) << 24);
}

void AActor::SetShade (int r, int g, int b)
{
	fillcolor = MAKEARGB(ColorMatcher.Pick (r, g, b), r, g, b);
}

//
// P_MobjThinker
//
void AActor::Tick ()
{
	// [RH] Data for Heretic/Hexen scrolling sectors
	static const BYTE HexenScrollDirs[8] = { 64, 0, 192, 128, 96, 32, 224, 160 };
	static const BYTE HexenSpeedMuls[3] = { 5, 10, 25 };
	static const SBYTE HexenScrollies[24][2] =
	{
		{  0,  1 }, {  0,  2 }, {  0,  4 },
		{ -1,  0 }, { -2,  0 }, { -4,  0 },
		{  0, -1 }, {  0, -2 }, {  0, -4 },
		{  1,  0 }, {  2,  0 }, {  4,  0 },
		{  1,  1 }, {  2,  2 }, {  4,  4 },
		{ -1,  1 }, { -2,  2 }, { -4,  4 },
		{ -1, -1 }, { -2, -2 }, { -4, -4 },
		{  1, -1 }, {  2, -2 }, {  4, -4 }
	};

	static const BYTE HereticScrollDirs[4] = { 6, 9, 1, 4 };
	static const BYTE HereticSpeedMuls[5] = { 5, 10, 25, 30, 35 };

	AActor *onmo;
	int i;

	assert (state != NULL);
	if (state == NULL)
	{
		Destroy();
		return;
	}

	PrevX = x;
	PrevY = y;
	PrevZ = z;

	if (flags5 & MF5_NOINTERACTION)
	{
		// only do the minimally necessary things here to save time:
		// Check the time freezer
		// apply velocity
		// ensure that the actor is not linked into the blockmap

		if (!(flags5 & MF5_NOTIMEFREEZE))
		{
			//Added by MC: Freeze mode.
			if (bglobal.freeze || level.flags2 & LEVEL2_FROZEN)
			{
				return;
			}
		}

		UnlinkFromWorld ();
		flags |= MF_NOBLOCKMAP;
		x += velx;
		y += vely;
		z += velz;
		LinkToWorld ();
	}
	else
	{
		AInventory * item = Inventory;

		// Handle powerup effects here so that the order is controlled
		// by the order in the inventory, not the order in the thinker table
		while (item != NULL && item->Owner == this)
		{
			item->DoEffect();
			item = item->Inventory;
		}

		if (flags & MF_UNMORPHED)
		{
			return;
		}

		if (!(flags5 & MF5_NOTIMEFREEZE))
		{
			//Added by MC: Freeze mode.
			if (bglobal.freeze && !(player && !player->isbot))
			{
				return;
			}

			// Apply freeze mode.
			if (( level.flags2 & LEVEL2_FROZEN ) && ( player == NULL || !( player->cheats & CF_TIMEFREEZE )))
			{
				return;
			}
		}


		if (cl_rockettrails & 2)
		{
			if (effects & FX_ROCKET) 
			{
				if (++smokecounter==4)
				{
					// add some smoke behind the rocket 
					smokecounter = 0;
					AActor * th = Spawn("RocketSmokeTrail", x-velx, y-vely, z-velz, ALLOW_REPLACE);
					if (th)
					{
						th->tics -= pr_rockettrail()&3;
						if (th->tics < 1) th->tics = 1;
					}
				}
			}
			else if (effects & FX_GRENADE) 
			{
				if (++smokecounter==8)
				{
					smokecounter = 0;
					angle_t moveangle = R_PointToAngle2(0,0,velx,vely);
					AActor * th = Spawn("GrenadeSmokeTrail", 
						x - FixedMul (finecosine[(moveangle)>>ANGLETOFINESHIFT], radius*2) + (pr_rockettrail()<<10),
						y - FixedMul (finesine[(moveangle)>>ANGLETOFINESHIFT], radius*2) + (pr_rockettrail()<<10),
						z - (height>>3) * (velz>>16) + (2*height)/3, ALLOW_REPLACE);
					if (th)
					{
						th->tics -= pr_rockettrail()&3;
						if (th->tics < 1) th->tics = 1;
					}
				}
			}
		}

		fixed_t oldz = z;

		// [RH] Give the pain elemental vertical friction
		// This used to be in APainElemental::Tick but in order to use
		// A_PainAttack with other monsters it has to be here
		if (flags4 & MF4_VFRICTION)
		{
			if (health >0)
			{
				if (abs (velz) < FRACUNIT/4)
				{
					velz = 0;
					flags4 &= ~MF4_VFRICTION;
				}
				else
				{
					velz = FixedMul (velz, 0xe800);
				}
			}
		}

		// [RH] Pulse in and out of visibility
		if (effects & FX_VISIBILITYPULSE)
		{
			if (visdir > 0)
			{
				alpha += 0x800;
				if (alpha >= OPAQUE)
				{
					alpha = OPAQUE;
					visdir = -1;
				}
			}
			else
			{
				alpha -= 0x800;
				if (alpha <= TRANSLUC25)
				{
					alpha = TRANSLUC25;
					visdir = 1;
				}
			}
		}
		else if (flags & MF_STEALTH)
		{
			// [RH] Fade a stealth monster in and out of visibility
			RenderStyle.Flags &= ~STYLEF_Alpha1;
			if (visdir > 0)
			{
				alpha += 2*FRACUNIT/TICRATE;
				if (alpha > OPAQUE)
				{
					alpha = OPAQUE;
					visdir = 0;
				}
			}
			else if (visdir < 0)
			{
				alpha -= 3*FRACUNIT/TICRATE/2;
				if (alpha < 0)
				{
					alpha = 0;
					visdir = 0;
				}
			}
		}

		if (bglobal.botnum && consoleplayer == Net_Arbitrator && !demoplayback &&
			((flags & (MF_SPECIAL|MF_MISSILE)) || (flags3 & MF3_ISMONSTER)))
		{
			BotSupportCycles.Clock();
			bglobal.m_Thinking = true;
			for (i = 0; i < MAXPLAYERS; i++)
			{
				if (!playeringame[i] || !players[i].isbot)
					continue;

				if (flags3 & MF3_ISMONSTER)
				{
					if (health > 0
						&& !players[i].enemy
						&& player ? !IsTeammate (players[i].mo) : true
						&& P_AproxDistance (players[i].mo->x-x, players[i].mo->y-y) < MAX_MONSTER_TARGET_DIST
						&& P_CheckSight (players[i].mo, this, 2))
					{ //Probably a monster, so go kill it.
						players[i].enemy = this;
					}
				}
				else if (flags & MF_SPECIAL)
				{ //Item pickup time
					//clock (BotWTG);
					bglobal.WhatToGet (players[i].mo, this);
					//unclock (BotWTG);
					BotWTG++;
				}
				else if (flags & MF_MISSILE)
				{
					if (!players[i].missile && (flags3 & MF3_WARNBOT))
					{ //warn for incoming missiles.
						if (target != players[i].mo && bglobal.Check_LOS (players[i].mo, this, ANGLE_90))
							players[i].missile = this;
					}
				}
			}
			bglobal.m_Thinking = false;
			BotSupportCycles.Unclock();
		}

		//End of MC

		// [RH] Consider carrying sectors here
		fixed_t cummx = 0, cummy = 0;
		if ((level.Scrolls != NULL || player != NULL) && !(flags & MF_NOCLIP) && !(flags & MF_NOSECTOR))
		{
			fixed_t height, waterheight;	// killough 4/4/98: add waterheight
			const msecnode_t *node;
			int countx, county;

			// killough 3/7/98: Carry things on floor
			// killough 3/20/98: use new sector list which reflects true members
			// killough 3/27/98: fix carrier bug
			// killough 4/4/98: Underwater, carry things even w/o gravity

			// Move objects only if on floor or underwater,
			// non-floating, and clipped.

			countx = county = 0;

			for (node = touching_sectorlist; node; node = node->m_tnext)
			{
				const sector_t *sec = node->m_sector;
				fixed_t scrollx, scrolly;

				if (level.Scrolls != NULL)
				{
					const FSectorScrollValues *scroll = &level.Scrolls[sec - sectors];
					scrollx = scroll->ScrollX;
					scrolly = scroll->ScrollY;
				}
				else
				{
					scrollx = scrolly = 0;
				}

				if (player != NULL)
				{
					int scrolltype = sec->special & 0xff;

					if (scrolltype >= Scroll_North_Slow &&
						scrolltype <= Scroll_SouthWest_Fast)
					{ // Hexen scroll special
						scrolltype -= Scroll_North_Slow;
						if (i_compatflags&COMPATF_RAVENSCROLL)
						{
							angle_t fineangle = HexenScrollDirs[scrolltype / 3] * 32;
							fixed_t carryspeed = DivScale32 (HexenSpeedMuls[scrolltype % 3], 32*CARRYFACTOR);
							scrollx += FixedMul (carryspeed, finecosine[fineangle]);
							scrolly += FixedMul (carryspeed, finesine[fineangle]);
						}
						else
						{
							// Use speeds that actually match the scrolling textures!
							scrollx -= HexenScrollies[scrolltype][0] << (FRACBITS-1);
							scrolly += HexenScrollies[scrolltype][1] << (FRACBITS-1);
						}
					}
					else if (scrolltype >= Carry_East5 &&
							 scrolltype <= Carry_West35)
					{ // Heretic scroll special
						scrolltype -= Carry_East5;
						BYTE dir = HereticScrollDirs[scrolltype / 5];
						fixed_t carryspeed = DivScale32 (HereticSpeedMuls[scrolltype % 5], 32*CARRYFACTOR);
						if (scrolltype<=Carry_East35 && !(i_compatflags&COMPATF_RAVENSCROLL)) 
						{
							// Use speeds that actually match the scrolling textures!
							carryspeed = (1 << ((scrolltype%5) + FRACBITS-1));
						}
						scrollx += carryspeed * ((dir & 3) - 1);
						scrolly += carryspeed * (((dir & 12) >> 2) - 1);
					}
					else if (scrolltype == dScroll_EastLavaDamage)
					{ // Special Heretic scroll special
						if (i_compatflags&COMPATF_RAVENSCROLL)
						{
							scrollx += DivScale32 (28, 32*CARRYFACTOR);
						}
						else
						{
							// Use a speed that actually matches the scrolling texture!
							scrollx += DivScale32 (12, 32*CARRYFACTOR);
						}
					}
					else if (scrolltype == Scroll_StrifeCurrent)
					{ // Strife scroll special
						int anglespeed = sec->tag - 100;
						fixed_t carryspeed = DivScale32 (anglespeed % 10, 16*CARRYFACTOR);
						angle_t fineangle = (anglespeed / 10) << (32-3);
						fineangle >>= ANGLETOFINESHIFT;
						scrollx += FixedMul (carryspeed, finecosine[fineangle]);
						scrolly += FixedMul (carryspeed, finesine[fineangle]);
					}
				}

				if ((scrollx | scrolly) == 0)
				{
					continue;
				}
				sector_t *heightsec = sec->GetHeightSec();
				if (flags & MF_NOGRAVITY && heightsec == NULL)
				{
					continue;
				}
				height = sec->floorplane.ZatPoint (x, y);
				if (z > height)
				{
					if (heightsec == NULL)
					{
						continue;
					}

					waterheight = heightsec->floorplane.ZatPoint (x, y);
					if (waterheight > height && z >= waterheight)
					{
						continue;
					}
				}

				cummx += scrollx;
				cummy += scrolly;
				if (scrollx) countx++;
				if (scrolly) county++;
			}

			// Some levels designed with Boom in mind actually want things to accelerate
			// at neighboring scrolling sector boundaries. But it is only important for
			// non-player objects.
			if (player != NULL || !(i_compatflags & COMPATF_BOOMSCROLL))
			{
				if (countx > 1)
				{
					cummx /= countx;
				}
				if (county > 1)
				{
					cummy /= county;
				}
			}
		}

		// [RH] If standing on a steep slope, fall down it
		if ((flags & MF_SOLID) && !(flags & (MF_NOCLIP|MF_NOGRAVITY)) &&
			!(flags & MF_NOBLOCKMAP) &&
			velz <= 0 &&
			floorz == z)
		{
			const secplane_t * floorplane = &floorsector->floorplane;
			static secplane_t copyplane;

#ifdef _3DFLOORS
			// Check 3D floors as well
			if (floorsector->e)	// apparently this can be called when the data is already gone-
			for(unsigned int i=0;i<floorsector->e->XFloor.ffloors.Size();i++)
			{
				F3DFloor * rover= floorsector->e->XFloor.ffloors[i];
				if(!(rover->flags & FF_SOLID) || !(rover->flags & FF_EXISTS)) continue;

				if (rover->top.plane->ZatPoint(x, y) == floorz)
				{
					copyplane = *rover->top.plane;
					if (copyplane.c<0) copyplane.FlipVert();
					floorplane = &copyplane;
					break;
				}
			}
#endif

			if (floorplane->c < STEEPSLOPE &&
				floorplane->ZatPoint (x, y) <= floorz)
			{
				const msecnode_t *node;
				bool dopush = true;

				if (floorplane->c > STEEPSLOPE*2/3)
				{
					for (node = touching_sectorlist; node; node = node->m_tnext)
					{
						const sector_t *sec = node->m_sector;
						if (sec->floorplane.c >= STEEPSLOPE)
						{
							if (floorplane->ZatPoint (x, y) >= z - MaxStepHeight)
							{
								dopush = false;
								break;
							}
						}
					}
				}
				if (dopush)
				{
					velx += floorplane->a;
					vely += floorplane->b;
				}
			}
		}

		// [RH] Missiles moving perfectly vertical need some X/Y movement, or they
		// won't hurt anything. Don't do this if damage is 0! That way, you can
		// still have missiles that go straight up and down through actors without
		// damaging anything.
		if ((flags & MF_MISSILE) && (velx|vely) == 0 && Damage != 0)
		{
			velx = 1;
		}

		// Handle X and Y velocities
		BlockingMobj = NULL;
		fixed_t oldfloorz = P_XYMovement (this, cummx, cummy);
		if (ObjectFlags & OF_EuthanizeMe)
		{ // actor was destroyed
			return;
		}
		if ((velx | vely) == 0) // Actors at rest
		{
			if (flags2 & MF2_BLASTED)
			{ // Reset to not blasted when velocities are gone
				flags2 &= ~MF2_BLASTED;
			}
			if ((flags6 & MF6_TOUCHY) && !IsSentient())
			{ // Arm a mine which has come to rest
				flags6 |= MF6_ARMED;
			}

		}
		if (flags2 & MF2_FLOATBOB)
		{ // Floating item bobbing motion
			z += FloatBobDiffs[(FloatBobPhase + level.maptime) & 63];
		}
		if (velz || BlockingMobj ||
			(z != floorz && (!(flags2 & MF2_FLOATBOB) ||
			(z - FloatBobOffsets[(FloatBobPhase + level.maptime) & 63] != floorz)
			)))
		{	// Handle Z velocity and gravity
			if (((flags2 & MF2_PASSMOBJ) || (flags & MF_SPECIAL)) && !(i_compatflags & COMPATF_NO_PASSMOBJ))
			{
				if (!(onmo = P_CheckOnmobj (this)))
				{
					P_ZMovement (this, oldfloorz);
					flags2 &= ~MF2_ONMOBJ;
				}
				else
				{
					if (player)
					{
						if (velz < (fixed_t)(level.gravity * Sector->gravity * -655.36f)
							&& !(flags&MF_NOGRAVITY))
						{
							PlayerLandedOnThing (this, onmo);
						}
					}
					if (onmo->z + onmo->height - z <= MaxStepHeight)
					{
						if (player && player->mo == this)
						{
							player->viewheight -= onmo->z + onmo->height - z;
							fixed_t deltaview = player->GetDeltaViewHeight();
							if (deltaview > player->deltaviewheight)
							{
								player->deltaviewheight = deltaview;
							}
						} 
						z = onmo->z + onmo->height;
					}
					flags2 |= MF2_ONMOBJ;
					velz = 0;
					Crash();
				}
			}
			else
			{
				P_ZMovement (this, oldfloorz);
			}

			if (ObjectFlags & OF_EuthanizeMe)
				return;		// actor was destroyed
		}
		else if (z <= floorz)
		{
			Crash();
		}

		UpdateWaterLevel (oldz);

		// [RH] Don't advance if predicting a player
		if (player && (player->cheats & CF_PREDICTING))
		{
			return;
		}
	}

	// cycle through states, calling action functions at transitions
	if (tics != -1)
	{
		tics--;
				
		// you can cycle through multiple states in a tic
		// [RH] Use <= 0 instead of == 0 so that spawnstates
		// of 0 tics work as expected.
		if (tics <= 0)
		{
			assert (state != NULL);
			if (state == NULL)
			{
				Destroy();
				return;
			}
			if (!SetState (state->GetNextState()))
				return; 		// freed itself
		}
	}
	else
	{
		int respawn_monsters = G_SkillProperty(SKILLP_Respawn);
		// check for nightmare respawn
		if (!(flags5 & MF5_ALWAYSRESPAWN))
		{
			if (!respawn_monsters || !(flags3 & MF3_ISMONSTER) || (flags2 & MF2_DORMANT) || (flags5 & MF5_NEVERRESPAWN))
				return;

			int limit = G_SkillProperty (SKILLP_RespawnLimit);
			if (limit > 0 && skillrespawncount >= limit)
				return;
		}

		movecount++;

		if (movecount < respawn_monsters)
			return;

		if (level.time & 31)
			return;

		if (pr_nightmarerespawn() > 4)
			return;

		P_NightmareRespawn (this);
	}
}

//==========================================================================
//
// AActor::UpdateWaterLevel
//
// Returns true if actor should splash
//
//==========================================================================

bool AActor::UpdateWaterLevel (fixed_t oldz, bool dosplash)
{
	BYTE lastwaterlevel = waterlevel;
	fixed_t fh=FIXED_MIN;
	bool reset=false;

	waterlevel = 0;

	if (Sector == NULL)
	{
		return false;
	}

	if (Sector->MoreFlags & SECF_UNDERWATER)	// intentionally not SECF_UNDERWATERMASK
	{
		waterlevel = 3;
	}
	else
	{
		const sector_t *hsec = Sector->GetHeightSec();
		if (hsec != NULL)
		{
			fh = hsec->floorplane.ZatPoint (x, y);
			//if (hsec->MoreFlags & SECF_UNDERWATERMASK)	// also check Boom-style non-swimmable sectors
			{
				if (z < fh)
				{
					waterlevel = 1;
					if (z + height/2 < fh)
					{
						waterlevel = 2;
						if ((player && z + player->viewheight <= fh) ||
							(z + height <= fh))
						{
							waterlevel = 3;
						}
					}
				}
				else if (z + height > hsec->ceilingplane.ZatPoint (x, y))
				{
					waterlevel = 3;
				}
				else
				{
					waterlevel=0;
				}
			}
			// even non-swimmable deep water must be checked here to do the splashes correctly
			// But the water level must be reset when this function returns
			if (!(hsec->MoreFlags&SECF_UNDERWATERMASK)) reset=true;
		}
#ifdef _3DFLOORS
		else
		{
			// Check 3D floors as well!
			for(unsigned int i=0;i<Sector->e->XFloor.ffloors.Size();i++)
			{
				F3DFloor*  rover=Sector->e->XFloor.ffloors[i];

				if (!(rover->flags & FF_EXISTS)) continue;
				if(!(rover->flags & FF_SWIMMABLE) || rover->flags & FF_SOLID) continue;

				fixed_t ff_bottom=rover->bottom.plane->ZatPoint(x, y);
				fixed_t ff_top=rover->top.plane->ZatPoint(x, y);

				if(ff_top <= z || ff_bottom > (z + (height >> 1))) continue;
				
				fh=ff_top;
				if (z < fh)
				{
					waterlevel = 1;
					if (z + height/2 < fh)
					{
						waterlevel = 2;
						if ((player && z + player->viewheight <= fh) ||
							(z + height <= fh))
						{
							waterlevel = 3;
						}
					}
				}

				break;
			}
		}
#endif
	}
		
	// some additional checks to make deep sectors like Boom's splash without setting
	// the water flags. 
	if (boomwaterlevel == 0 && waterlevel != 0 && dosplash) 
	{
		P_HitWater(this, Sector, FIXED_MIN, FIXED_MIN, fh, true);
	}
	boomwaterlevel=waterlevel;
	if (reset) waterlevel=lastwaterlevel;
	return false;	// we did the splash ourselves
}

//==========================================================================
//
// P_SpawnMobj
//
//==========================================================================

AActor *AActor::StaticSpawn (const PClass *type, fixed_t ix, fixed_t iy, fixed_t iz, replace_t allowreplacement, bool SpawningMapThing)
{
	if (type == NULL)
	{
		I_Error ("Tried to spawn a class-less actor\n");
	}

	if (type->ActorInfo == NULL)
	{
		I_Error ("%s is not an actor\n", type->TypeName.GetChars());
	}

	if (allowreplacement)
		type = type->ActorInfo->GetReplacement()->Class;


	AActor *actor;
	
	actor = static_cast<AActor *>(const_cast<PClass *>(type)->CreateNew ());

	actor->x = actor->PrevX = ix;
	actor->y = actor->PrevY = iy;
	actor->z = actor->PrevZ = iz;
	actor->picnum.SetInvalid();
	actor->health = actor->SpawnHealth();

	FRandom &rng = bglobal.m_Thinking ? pr_botspawnmobj : pr_spawnmobj;

	if (actor->isFast() && actor->flags3 & MF3_ISMONSTER)
		actor->reactiontime = 0;

	if (actor->flags3 & MF3_ISMONSTER)
	{
		actor->LastLookPlayerNumber = rng() % MAXPLAYERS;
		actor->TIDtoHate = 0;
	}

	// Set the state, but do not use SetState, because action
	// routines can't be called yet.  If the spawnstate has an action
	// routine, it will not be called.
	FState *st = actor->SpawnState;
	actor->state = st;
	actor->tics = st->GetTics();
	
	actor->sprite = st->sprite;
	actor->frame = st->GetFrame();
	actor->renderflags = (actor->renderflags & ~RF_FULLBRIGHT) | st->GetFullbright();
	actor->touching_sectorlist = NULL;	// NULL head of sector list // phares 3/13/98
	if (G_SkillProperty(SKILLP_FastMonsters))
		actor->Speed = actor->GetClass()->Meta.GetMetaFixed(AMETA_FastSpeed, actor->Speed);


	// set subsector and/or block links
	actor->LinkToWorld (SpawningMapThing);

	actor->dropoffz =			// killough 11/98: for tracking dropoffs
	actor->floorz = actor->Sector->floorplane.ZatPoint (ix, iy);
	actor->ceilingz = actor->Sector->ceilingplane.ZatPoint (ix, iy);

	// The z-coordinate needs to be set once before calling P_FindFloorCeiling
	// For FLOATRANDZ just use the floor here.
	if (iz == ONFLOORZ || iz == FLOATRANDZ)
	{
		actor->z = actor->floorz;
	}
	else if (iz == ONCEILINGZ)
	{
		actor->z = actor->ceilingz - actor->height;
	}

	if (SpawningMapThing || !type->IsDescendantOf (RUNTIME_CLASS(APlayerPawn)))
	{
		// Check if there's something solid to stand on between the current position and the
		// current sector's floor. For map spawns this must be delayed until after setting the
		// z-coordinate.
		if (!SpawningMapThing) 
		{
			P_FindFloorCeiling(actor, true);
		}
		else
		{
			actor->floorsector = actor->Sector;
			actor->floorpic = actor->floorsector->GetTexture(sector_t::floor);
			actor->ceilingsector = actor->Sector;
			actor->ceilingpic = actor->ceilingsector->GetTexture(sector_t::ceiling);
		}
	}
	else if (!(actor->flags5 & MF5_NOINTERACTION))
	{
		P_FindFloorCeiling (actor);
	}
	else
	{
		actor->floorpic = actor->Sector->GetTexture(sector_t::floor);
		actor->floorsector = actor->Sector;
		actor->ceilingpic = actor->Sector->GetTexture(sector_t::ceiling);
		actor->ceilingsector = actor->Sector;
	}

	actor->SpawnPoint[0] = ix;
	actor->SpawnPoint[1] = iy;

	if (iz == ONFLOORZ)
	{
		actor->z = actor->floorz;
	}
	else if (iz == ONCEILINGZ)
	{
		actor->z = actor->ceilingz - actor->height;
	}
	else if (iz == FLOATRANDZ)
	{
		fixed_t space = actor->ceilingz - actor->height - actor->floorz;
		if (space > 48*FRACUNIT)
		{
			space -= 40*FRACUNIT;
			actor->z = MulScale8 (space, rng()) + actor->floorz + 40*FRACUNIT;
		}
		else
		{
			actor->z = actor->floorz;
		}
	}
	else
	{
		actor->SpawnPoint[2] = (actor->z - actor->floorz);
	}

	if (actor->flags2 & MF2_FLOATBOB)
	{ // Prime the bobber
		actor->FloatBobPhase = rng();
		actor->z += FloatBobOffsets[(actor->FloatBobPhase + level.maptime - 1) & 63];
	}
	if (actor->flags2 & MF2_FLOORCLIP)
	{
		actor->AdjustFloorClip ();
	}
	else
	{
		actor->floorclip = 0;
	}
	actor->UpdateWaterLevel (actor->z, false);
	if (!SpawningMapThing)
	{
		actor->BeginPlay ();
		if (actor->ObjectFlags & OF_EuthanizeMe)
		{
			return NULL;
		}
	}
	if (level.flags & LEVEL_NOALLIES && !actor->player)
	{
		actor->flags &= ~MF_FRIENDLY;
	}
	// [RH] Count monsters whenever they are spawned.
	if (actor->CountsAsKill())
	{
		level.total_monsters++;
	}
	// [RH] Same, for items
	if (actor->flags & MF_COUNTITEM)
	{
		level.total_items++;
	}
	screen->StateChanged(actor);
	return actor;
}

AActor *Spawn (const char *type, fixed_t x, fixed_t y, fixed_t z, replace_t allowreplacement)
{
	const PClass *cls = PClass::FindClass(type);
	if (cls == NULL) 
	{
		I_Error("Attempt to spawn actor of unknown type '%s'\n", type);
	}
	return AActor::StaticSpawn (cls, x, y, z, allowreplacement);
}

void AActor::LevelSpawned ()
{
	if (tics > 0 && !(flags4 & MF4_SYNCHRONIZED))
		tics = 1 + (pr_spawnmapthing() % tics);
	angle_t incs = AngleIncrements ();
	angle -= angle % incs;
	flags &= ~MF_DROPPED;		// [RH] clear MF_DROPPED flag
	HandleSpawnFlags ();
}

void AActor::HandleSpawnFlags ()
{
	if (SpawnFlags & MTF_AMBUSH)
	{
		flags |= MF_AMBUSH;
	}
	if (SpawnFlags & MTF_DORMANT)
	{
		Deactivate (NULL);
	}
	if (SpawnFlags & MTF_STANDSTILL)
	{
		flags4 |= MF4_STANDSTILL;
	}
	if (SpawnFlags & MTF_FRIENDLY)
	{
		flags |= MF_FRIENDLY;
		// Friendlies don't count as kills!
		if (flags & MF_COUNTKILL)
		{
			flags &= ~MF_COUNTKILL;
			level.total_monsters--;
		}
	}
	if (SpawnFlags & MTF_SHADOW)
	{
		flags |= MF_SHADOW;
		RenderStyle = STYLE_Translucent;
		alpha = TRANSLUC25;
	}
	else if (SpawnFlags & MTF_ALTSHADOW)
	{
		RenderStyle = STYLE_None;
	}
}

void AActor::BeginPlay ()
{
	// If the actor is spawned with the dormant flag set, clear it, and use
	// the normal deactivation logic to make it properly dormant.
	if (flags2 & MF2_DORMANT)
	{
		flags2 &= ~MF2_DORMANT;
		Deactivate (NULL);
	}
}

bool AActor::isFast()
{
	if (flags5&MF5_ALWAYSFAST) return true;
	if (flags5&MF5_NEVERFAST) return false;
	return !!G_SkillProperty(SKILLP_FastMonsters);
}

void AActor::Activate (AActor *activator)
{
	if ((flags3 & MF3_ISMONSTER) && (health > 0 || (flags & MF_ICECORPSE)))
	{
		if (flags2 & MF2_DORMANT)
		{
			flags2 &= ~MF2_DORMANT;
			FState *state = FindState(NAME_Active);
			if (state != NULL) 
			{
				SetState(state);
			}
			else
			{
				tics = 1;
			}
		}
	}
}

void AActor::Deactivate (AActor *activator)
{
	if ((flags3 & MF3_ISMONSTER) && (health > 0 || (flags & MF_ICECORPSE)))
	{
		if (!(flags2 & MF2_DORMANT))
		{
			flags2 |= MF2_DORMANT;
			FState *state = FindState(NAME_Inactive);
			if (state != NULL) 
			{
				SetState(state);
			}
			else
			{
				tics = -1;
			}
		}
	}
}

//
// P_RemoveMobj
//

void AActor::Destroy ()
{
	// [RH] Destroy any inventory this actor is carrying
	DestroyAllInventory ();

	// [RH] Unlink from tid chain
	RemoveFromHash ();

	// unlink from sector and block lists
	UnlinkFromWorld ();
	flags |= MF_NOSECTOR|MF_NOBLOCKMAP;

	// Delete all nodes on the current sector_list			phares 3/16/98
	P_DelSector_List();

	// Transform any playing sound into positioned, non-actor sounds.
	S_RelinkSound (this, NULL);

	Super::Destroy ();
}

//===========================================================================
//
// AdjustFloorClip
//
//===========================================================================

void AActor::AdjustFloorClip ()
{
	if (flags3 & MF3_SPECIALFLOORCLIP)
	{
		return;
	}

	fixed_t oldclip = floorclip;
	fixed_t shallowestclip = FIXED_MAX;
	const msecnode_t *m;

	// possibly standing on a 3D-floor!
	if (Sector->e->XFloor.ffloors.Size() && z>Sector->floorplane.ZatPoint(x,y)) floorclip=0;

	// [RH] clip based on shallowest floor player is standing on
	// If the sector has a deep water effect, then let that effect
	// do the floorclipping instead of the terrain type.
	for (m = touching_sectorlist; m; m = m->m_tnext)
	{
		sector_t *hsec = m->m_sector->GetHeightSec();
		if (hsec == NULL && m->m_sector->floorplane.ZatPoint (x, y) == z)
		{
			fixed_t clip = Terrains[TerrainTypes[m->m_sector->GetTexture(sector_t::floor)]].FootClip;
			if (clip < shallowestclip)
			{
				shallowestclip = clip;
			}
		}
	}
	if (shallowestclip == FIXED_MAX)
	{
		floorclip = 0;
	}
	else
	{
		floorclip = shallowestclip;
	}
	if (player && player->mo == this && oldclip != floorclip)
	{
		player->viewheight -= oldclip - floorclip;
		player->deltaviewheight = player->GetDeltaViewHeight();
	}
}

//
// P_SpawnPlayer
// Called when a player is spawned on the level.
// Most of the player structure stays unchanged between levels.
//
EXTERN_CVAR (Bool, chasedemo)

extern bool demonew;

APlayerPawn *P_SpawnPlayer (FMapThing *mthing, bool tempplayer)
{
	int		  playernum;
	player_t *p;
	APlayerPawn *mobj, *oldactor;
	BYTE	  state;
	fixed_t spawn_x, spawn_y;
	angle_t spawn_angle;

	// [RH] Things 4001-? are also multiplayer starts. Just like 1-4.
	//		To make things simpler, figure out which player is being
	//		spawned here.
	if (mthing->type <= 4 || gameinfo.gametype == GAME_Strife)		// don't forget Strife's starts 5-8 here!
	{
		playernum = mthing->type - 1;
	}
	else if (gameinfo.gametype != GAME_Hexen)
	{
		playernum = mthing->type - 4001 + 4;
	}
	else
	{
		playernum = mthing->type - 9100 + 4;
	}

	// not playing?
	if (playernum >= MAXPLAYERS || !playeringame[playernum])
		return NULL;

	p = &players[playernum];

	if (p->cls == NULL)
	{
		// [GRB] Pick a class from player class list
		if (PlayerClasses.Size () > 1)
		{
			int type;

			if (!deathmatch || !multiplayer)
			{
				type = SinglePlayerClass[playernum];
			}
			else
			{
				type = p->userinfo.PlayerClass;
				if (type < 0)
				{
					type = pr_multiclasschoice() % PlayerClasses.Size ();
				}
			}
			p->CurrentPlayerClass = type;
		}
		else
		{
			p->CurrentPlayerClass = 0;
		}
		p->cls = PlayerClasses[p->CurrentPlayerClass].Type;
	}

	if (( dmflags2 & DF2_SAME_SPAWN_SPOT ) &&
		( p->playerstate == PST_REBORN ) &&
		( deathmatch == false ) &&
		( gameaction != ga_worlddone ) &&
		( p->mo != NULL ) && 
		( !(p->mo->Sector->Flags & SECF_NORESPAWN) ) &&
		( (p->mo->Sector->special & 255) != Damage_InstantDeath ))
	{
		spawn_x = p->mo->x;
		spawn_y = p->mo->y;
		spawn_angle = p->mo->angle;
	}
	else
	{
		spawn_x = mthing->x;
		spawn_y = mthing->y;
		spawn_angle = ANG45 * (mthing->angle/45);
	}

	mobj = static_cast<APlayerPawn *>
		(Spawn (p->cls, spawn_x, spawn_y, ONFLOORZ, NO_REPLACE));

	mobj->FriendPlayer = playernum + 1;	// [RH] players are their own friends
	oldactor = p->mo;
	p->mo = mobj;
	mobj->player = p;
	state = p->playerstate;
	if (state == PST_REBORN || state == PST_ENTER)
	{
		G_PlayerReborn (playernum);
	}
	else if (oldactor != NULL && oldactor->player == p && !tempplayer)
	{
		// Move the voodoo doll's inventory to the new player.
		mobj->ObtainInventory (oldactor);
		FBehavior::StaticStopMyScripts (oldactor);	// cancel all ENTER/RESPAWN scripts for the voodoo doll
	}

	// [GRB] Reset skin
	p->userinfo.skin = R_FindSkin (skins[p->userinfo.skin].name, p->CurrentPlayerClass);
	StatusBar->SetFace (&skins[p->userinfo.skin]);

	// [RH] Be sure the player has the right translation
	R_BuildPlayerTranslation (playernum);

	// [RH] set color translations for player sprites
	mobj->Translation = TRANSLATION(TRANSLATION_Players,playernum);

	mobj->angle = spawn_angle;
	mobj->pitch = mobj->roll = 0;
	mobj->health = p->health;

	//Added by MC: Identification (number in the players[MAXPLAYERS] array)
    mobj->id = playernum;

	// [RH] Set player sprite based on skin
	mobj->sprite = skins[p->userinfo.skin].sprite;
	mobj->scaleX = skins[p->userinfo.skin].ScaleX;
	mobj->scaleY = skins[p->userinfo.skin].ScaleY;

	p->DesiredFOV = p->FOV = 90.f;
	p->camera = p->mo;
	p->playerstate = PST_LIVE;
	p->refire = 0;
	p->damagecount = 0;
	p->bonuscount = 0;
	p->morphTics = 0;
	p->MorphedPlayerClass = 0;
	p->MorphStyle = 0;
	p->MorphExitFlash = NULL;
	p->extralight = 0;
	p->fixedcolormap = NOFIXEDCOLORMAP;
	p->fixedlightlevel = -1;
	p->viewheight = mobj->ViewHeight;
	p->inconsistant = 0;
	p->attacker = NULL;
	p->spreecount = 0;
	p->multicount = 0;
	p->lastkilltime = 0;
	p->BlendR = p->BlendG = p->BlendB = p->BlendA = 0.f;
	p->mo->ResetAirSupply(false);
	p->Uncrouch();

	p->velx = p->vely = 0;		// killough 10/98: initialize bobbing to 0.

	if (players[consoleplayer].camera == oldactor)
	{
		players[consoleplayer].camera = mobj;
	}

	// [RH] Allow chasecam for demo watching
	if ((demoplayback || demonew) && chasedemo)
		p->cheats = CF_CHASECAM;

	// setup gun psprite
	if (!tempplayer)
	{
		// This can also start a script so don't do it for
		// the dummy player.
		P_SetupPsprites (p);
	}

	if (deathmatch)
	{ // Give all cards in death match mode.
		p->mo->GiveDeathmatchInventory ();
	}
	else if ((multiplayer || (level.flags2 & LEVEL2_ALLOWRESPAWN)) && state == PST_REBORN && oldactor != NULL)
	{ // Special inventory handling for respawning in coop
		p->mo->FilterCoopRespawnInventory (oldactor);
	}
	if (oldactor != NULL)
	{ // Remove any inventory left from the old actor. Coop handles
	  // it above, but the other modes don't.
		oldactor->DestroyAllInventory();
	}
	// [BC] Handle temporary invulnerability when respawned
	if ((state == PST_REBORN || state == PST_ENTER) &&
		(dmflags2 & DF2_YES_RESPAWN_INVUL) &&
		(multiplayer || alwaysapplydmflags))
	{
		APowerup *invul = static_cast<APowerup*>(p->mo->GiveInventoryType (RUNTIME_CLASS(APowerInvulnerable)));
		invul->EffectTics = 3*TICRATE;
		invul->BlendColor = 0;				// don't mess with the view
		p->mo->effects |= FX_RESPAWNINVUL;	// [RH] special effect
	}

	if (StatusBar != NULL && (playernum == consoleplayer || StatusBar->GetPlayer() == playernum))
	{
		StatusBar->AttachToPlayer (p);
	}

	if (multiplayer)
	{
		unsigned an = mobj->angle >> ANGLETOFINESHIFT;
		Spawn ("TeleportFog", mobj->x+20*finecosine[an], mobj->y+20*finesine[an], mobj->z + TELEFOGHEIGHT, ALLOW_REPLACE);
	}

	// "Fix" for one of the starts on exec.wad MAP01: If you start inside the ceiling,
	// drop down below it, even if that means sinking into the floor.
	if (mobj->z + mobj->height > mobj->ceilingz)
	{
		mobj->z = mobj->ceilingz - mobj->height;
	}

	// [BC] Do script stuff
	if (!tempplayer)
	{
		if (state == PST_ENTER || (state == PST_LIVE && !savegamerestore))
		{
			FBehavior::StaticStartTypedScripts (SCRIPT_Enter, p->mo, true);
		}
		else if (state == PST_REBORN)
		{
			assert (oldactor != NULL);

			// before relocating all pointers to the player all sound targets
			// pointing to the old actor have to be NULLed. Otherwise all
			// monsters who last targeted this player will wake up immediately
			// after the player has respawned.
			AActor *th;
			TThinkerIterator<AActor> it;
			while ((th = it.Next()))
			{
				if (th->LastHeard == oldactor) th->LastHeard = NULL;
			}
			for(int i = 0; i < numsectors; i++)
			{
				if (sectors[i].SoundTarget == oldactor) sectors[i].SoundTarget = NULL;
			}

			DObject::StaticPointerSubstitution (oldactor, p->mo);
			// PointerSubstitution() will also affect the bodyque, so undo that now.
			for (int ii=0; ii < BODYQUESIZE; ++ii)
				if (bodyque[ii] == p->mo)
					bodyque[ii] = oldactor;
			FBehavior::StaticStartTypedScripts (SCRIPT_Respawn, p->mo, true);
		}
	}
	return mobj;
}


//
// P_SpawnMapThing
// The fields of the mapthing should
// already be in host byte order.
//
// [RH] position is used to weed out unwanted start spots
AActor *P_SpawnMapThing (FMapThing *mthing, int position)
{
	const PClass *i;
	int mask;
	AActor *mobj;
	fixed_t x, y, z;

	if (mthing->type == 0 || mthing->type == -1)
		return NULL;

	// count deathmatch start positions
	if (mthing->type == 11)
	{
		deathmatchstarts.Push (*mthing);
		return NULL;
	}

	// Convert Strife starts to Hexen-style starts
	if (gameinfo.gametype == GAME_Strife && mthing->type >= 118 && mthing->type <= 127)
	{
		mthing->args[0] = mthing->type - 117;
		mthing->type = 1;
	}

	// [RH] Record polyobject-related things
	if (gameinfo.gametype == GAME_Hexen)
	{
		switch (mthing->type)
		{
		case PO_HEX_ANCHOR_TYPE:
			mthing->type = PO_ANCHOR_TYPE;
			break;
		case PO_HEX_SPAWN_TYPE:
			mthing->type = PO_SPAWN_TYPE;
			break;
		case PO_HEX_SPAWNCRUSH_TYPE:
			mthing->type = PO_SPAWNCRUSH_TYPE;
			break;
		}
	}

	if (mthing->type == PO_ANCHOR_TYPE ||
		mthing->type == PO_SPAWN_TYPE ||
		mthing->type == PO_SPAWNCRUSH_TYPE ||
		mthing->type == PO_SPAWNHURT_TYPE)
	{
		polyspawns_t *polyspawn = new polyspawns_t;
		polyspawn->next = polyspawns;
		polyspawn->x = mthing->x;
		polyspawn->y = mthing->y;
		polyspawn->angle = mthing->angle;
		polyspawn->type = mthing->type;
		polyspawns = polyspawn;
		if (mthing->type != PO_ANCHOR_TYPE)
			po_NumPolyobjs++;
		return NULL;
	}

	// check for players specially
	int pnum = -1;

	if (mthing->type <= 4 && mthing->type > 0)
	{
		pnum = mthing->type - 1;
	}
	else
	{
		const int base = (gameinfo.gametype == GAME_Strife) ? 5 :
						 (gameinfo.gametype == GAME_Hexen) ? 9100 : 4001;

		if (mthing->type >= base && mthing->type < base + MAXPLAYERS - 4)
		{
			pnum = mthing->type - base + 4;
		}
	}

	if (pnum == -1 || (level.flags & LEVEL_FILTERSTARTS))
	{
		// check for appropriate game type
		if (deathmatch) 
		{
			mask = MTF_DEATHMATCH;
		}
		else if (multiplayer)
		{
			mask = MTF_COOPERATIVE;
		}
		else
		{
			mask = MTF_SINGLE;
		}
		if (!(mthing->flags & mask))
		{
			return NULL;
		}

		mask = G_SkillProperty(SKILLP_SpawnFilter);
		if (!(mthing->SkillFilter & mask))
		{
			return NULL;
		}

		// Check class spawn masks. Now with player classes available
		// this is enabled for all games.
		if (!multiplayer)
		{ // Single player
			int spawnmask = players[consoleplayer].GetSpawnClass();
			if (spawnmask != 0 && (mthing->ClassFilter & spawnmask) == 0)
			{ // Not for current class
				return NULL;
			}
		}
		else if (!deathmatch)
		{ // Cooperative
			mask = 0;
			for (int i = 0; i < MAXPLAYERS; i++)
			{
				if (playeringame[i])
				{
					int spawnmask = players[i].GetSpawnClass();
					if (spawnmask != 0)
						mask |= spawnmask;
					else 
						mask = -1;
				}
			}
			if (mask != -1 && (mthing->ClassFilter & mask) == 0)
			{
				return NULL;
			}
		}
	}

	if (pnum != -1)
	{
		// [RH] Only spawn spots that match position.
		if (mthing->args[0] != position)
			return NULL;

		// save spots for respawning in network games
		playerstarts[pnum] = *mthing;
		if (!deathmatch)
			return P_SpawnPlayer (mthing);

		return NULL;
	}

	// [RH] sound sequence overriders
	if (mthing->type >= 1400 && mthing->type < 1410)
	{
		P_PointInSector (mthing->x, mthing->y)->seqType = mthing->type - 1400;
		return NULL;
	}
	else if (mthing->type == 1411)
	{
		int type;

		if (mthing->args[0] == 255)
			type = -1;
		else
			type = mthing->args[0];

		if (type > 63)
		{
			Printf ("Sound sequence %d out of range\n", type);
		}
		else
		{
			P_PointInSector (mthing->x,	mthing->y)->seqType = type;
		}
		return NULL;
	}

	// [RH] Determine if it is an old ambient thing, and if so,
	//		map it to MT_AMBIENT with the proper parameter.
	if (mthing->type >= 14001 && mthing->type <= 14064)
	{
		mthing->args[0] = mthing->type - 14000;
		mthing->type = 14065;
	}
	// find which type to spawn
	i = DoomEdMap.FindType (mthing->type);

	if (i == NULL)
	{
		// [RH] Don't die if the map tries to spawn an unknown thing
		Printf ("Unknown type %i at (%i, %i)\n",
				 mthing->type,
				 mthing->x>>FRACBITS, mthing->y>>FRACBITS);
		i = PClass::FindClass("Unknown");
	}
	// [RH] If the thing's corresponding sprite has no frames, also map
	//		it to the unknown thing.
	else
	{
		// Handle decorate replacements explicitly here
		// to check for missing frames in the replacement object.
		i = i->ActorInfo->GetReplacement()->Class;

		const AActor *defaults = GetDefaultByType (i);
		if (defaults->SpawnState == NULL ||
			sprites[defaults->SpawnState->sprite].numframes == 0)
		{
			Printf ("%s at (%i, %i) has no frames\n",
					i->TypeName.GetChars(), mthing->x>>FRACBITS, mthing->y>>FRACBITS);
			i = PClass::FindClass("Unknown");
		}
	}

	const AActor *info = GetDefaultByType (i);

	// don't spawn keycards and players in deathmatch
	if (deathmatch && info->flags & MF_NOTDMATCH)
		return NULL;

	// [RH] don't spawn extra weapons in coop if so desired
	if (multiplayer && !deathmatch && (dmflags & DF_NO_COOP_WEAPON_SPAWN))
	{
		if (i->IsDescendantOf (RUNTIME_CLASS(AWeapon)))
		{
			if ((mthing->flags & (MTF_DEATHMATCH|MTF_SINGLE)) == MTF_DEATHMATCH)
				return NULL;
		}
	}

	// don't spawn any monsters if -nomonsters
	if (((level.flags2 & LEVEL2_NOMONSTERS) || (dmflags & DF_NO_MONSTERS)) && info->flags3 & MF3_ISMONSTER )
	{
		return NULL;
	}
	
	// [RH] Other things that shouldn't be spawned depending on dmflags
	if (deathmatch || alwaysapplydmflags)
	{
		if (dmflags & DF_NO_HEALTH)
		{
			if (i->IsDescendantOf (RUNTIME_CLASS(AHealth)))
				return NULL;
			if (i->TypeName == NAME_Berserk)
				return NULL;
			if (i->TypeName == NAME_Megasphere)
				return NULL;
		}
		if (dmflags & DF_NO_ITEMS)
		{
//			if (i->IsDescendantOf (RUNTIME_CLASS(AArtifact)))
//				return;
		}
		if (dmflags & DF_NO_ARMOR)
		{
			if (i->IsDescendantOf (RUNTIME_CLASS(AArmor)))
				return NULL;
			if (i->TypeName == NAME_Megasphere)
				return NULL;
		}
	}

	// spawn it
	x = mthing->x;
	y = mthing->y;

	if (info->flags & MF_SPAWNCEILING)
		z = ONCEILINGZ;
	else if (info->flags2 & MF2_SPAWNFLOAT)
		z = FLOATRANDZ;
	else
		z = ONFLOORZ;

	mobj = AActor::StaticSpawn (i, x, y, z, NO_REPLACE, true);

	if (z == ONFLOORZ)
		mobj->z += mthing->z;
	else if (z == ONCEILINGZ)
		mobj->z -= mthing->z;

	mobj->SpawnPoint[0] = mthing->x;
	mobj->SpawnPoint[1] = mthing->y;
	mobj->SpawnPoint[2] = mthing->z;
	mobj->SpawnAngle = mthing->angle;
	mobj->SpawnFlags = mthing->flags;
	P_FindFloorCeiling(mobj, true);

	if (!(mobj->flags2 & MF2_ARGSDEFINED))
	{
		// [RH] Set the thing's special
		mobj->special = mthing->special;
		for(int j=0;j<5;j++) mobj->args[j]=mthing->args[j];
	}

	// [RH] Add ThingID to mobj and link it in with the others
	mobj->tid = mthing->thingid;
	mobj->AddToHash ();

	mobj->angle = (DWORD)((mthing->angle * UCONST64(0x100000000)) / 360);
	mobj->BeginPlay ();
	if (!(mobj->ObjectFlags & OF_EuthanizeMe))
	{
		mobj->LevelSpawned ();
	}
	return mobj;
}



//
// GAME SPAWN FUNCTIONS
//


//
// P_SpawnPuff
//

AActor *P_SpawnPuff (AActor *source, const PClass *pufftype, fixed_t x, fixed_t y, fixed_t z, angle_t dir, int updown, int flags)
{
	AActor *puff;

	z += pr_spawnpuff.Random2 () << 10;

	puff = Spawn (pufftype, x, y, z, ALLOW_REPLACE);
	if (puff == NULL) return NULL;
	if (source != NULL) puff->angle = R_PointToAngle2(x, y, source->x, source->y);

	// If a puff has a crash state and an actor was not hit,
	// it will enter the crash state. This is used by the StrifeSpark
	// and BlasterPuff.
	FState *crashstate;
	if (!(flags & PF_HITTHING) && (crashstate = puff->FindState(NAME_Crash)) != NULL)
	{
		puff->SetState (crashstate);
	}
	else if ((flags & PF_MELEERANGE) && puff->MeleeState != NULL)
	{
		// handle the hard coded state jump of Doom's bullet puff
		// in a more flexible manner.
		puff->SetState (puff->MeleeState);
	}

	if (!(flags & PF_TEMPORARY))
	{
		if (cl_pufftype && updown != 3 && (puff->flags4 & MF4_ALLOWPARTICLES))
		{
			P_DrawSplash2 (32, x, y, z, dir, updown, 1);
			puff->renderflags |= RF_INVISIBLE;
		}

		if ((flags & PF_HITTHING) && puff->SeeSound)
		{ // Hit thing sound
			S_Sound (puff, CHAN_BODY, puff->SeeSound, 1, ATTN_NORM);
		}
		else if (puff->AttackSound)
		{
			S_Sound (puff, CHAN_BODY, puff->AttackSound, 1, ATTN_NORM);
		}
	}

	// [BB] If the puff came from a player, set the target of the puff to this player.
	if ( puff && (puff->flags5 & MF5_PUFFGETSOWNER))
		puff->target = source;

	return puff;
}



//---------------------------------------------------------------------------
//
// P_SpawnBlood
// 
//---------------------------------------------------------------------------

void P_SpawnBlood (fixed_t x, fixed_t y, fixed_t z, angle_t dir, int damage, AActor *originator)
{
	AActor *th;
	PalEntry bloodcolor = (PalEntry)originator->GetClass()->Meta.GetMetaInt(AMETA_BloodColor);
	const PClass *bloodcls = PClass::FindClass((ENamedName)originator->GetClass()->Meta.GetMetaInt(AMETA_BloodType, NAME_Blood));

	if (bloodcls!=NULL && cl_bloodtype <= 1)
	{
		z += pr_spawnblood.Random2 () << 10;
		th = Spawn (bloodcls, x, y, z, ALLOW_REPLACE);
		th->velz = FRACUNIT*2;
		th->angle = dir;
		if (gameinfo.gametype & GAME_DoomChex)
		{
			th->tics -= pr_spawnblood() & 3;

			if (th->tics < 1)
				th->tics = 1;
		}
		// colorize the blood
		if (bloodcolor != 0 && !(th->flags2 & MF2_DONTTRANSLATE))
		{
			th->Translation = TRANSLATION(TRANSLATION_Blood, bloodcolor.a);
		}
		
		// Moved out of the blood actor so that replacing blood is easier
		if (gameinfo.gametype & GAME_DoomStrifeChex)
		{
			if (gameinfo.gametype == GAME_Strife)
			{
				if (damage > 13)
				{
					FState *state = th->FindState(NAME_Spray);
					if (state != NULL) th->SetState (state);
				}
				else damage+=2;
			}
			if (damage <= 12 && damage >= 9)
			{
				th->SetState (th->SpawnState + 1);
			}
			else if (damage < 9)
			{
				th->SetState (th->SpawnState + 2);
			}
		}
	}

	if (cl_bloodtype >= 1)
		P_DrawSplash2 (40, x, y, z, dir, 2, bloodcolor);
}

//---------------------------------------------------------------------------
//
// PROC P_BloodSplatter
//
//---------------------------------------------------------------------------

void P_BloodSplatter (fixed_t x, fixed_t y, fixed_t z, AActor *originator)
{
	PalEntry bloodcolor = (PalEntry)originator->GetClass()->Meta.GetMetaInt(AMETA_BloodColor);
	const PClass *bloodcls = PClass::FindClass((ENamedName)originator->GetClass()->Meta.GetMetaInt(AMETA_BloodType2, NAME_BloodSplatter));

	if (bloodcls!=NULL && cl_bloodtype <= 1)
	{
		AActor *mo;

		mo = Spawn(bloodcls, x, y, z, ALLOW_REPLACE);
		mo->target = originator;
		mo->velx = pr_splatter.Random2 () << 10;
		mo->vely = pr_splatter.Random2 () << 10;
		mo->velz = 3*FRACUNIT;

		// colorize the blood!
		if (bloodcolor!=0 && !(mo->flags2 & MF2_DONTTRANSLATE)) 
		{
			mo->Translation = TRANSLATION(TRANSLATION_Blood, bloodcolor.a);
		}
	}
	if (cl_bloodtype >= 1)
	{
		P_DrawSplash2 (40, x, y, z, R_PointToAngle2 (x, y, originator->x, originator->y), 2, bloodcolor);
	}
}

//===========================================================================
//
//  P_BloodSplatter2
//
//===========================================================================

void P_BloodSplatter2 (fixed_t x, fixed_t y, fixed_t z, AActor *originator)
{
	PalEntry bloodcolor = (PalEntry)originator->GetClass()->Meta.GetMetaInt(AMETA_BloodColor);
	const PClass *bloodcls = PClass::FindClass((ENamedName)originator->GetClass()->Meta.GetMetaInt(AMETA_BloodType3, NAME_AxeBlood));

	if (bloodcls!=NULL && cl_bloodtype <= 1)
	{
		AActor *mo;
		
		x += ((pr_splat()-128)<<11);
		y += ((pr_splat()-128)<<11);

		mo = Spawn (bloodcls, x, y, z, ALLOW_REPLACE);
		mo->target = originator;

		// colorize the blood!
		if (bloodcolor != 0 && !(mo->flags2 & MF2_DONTTRANSLATE))
		{
			mo->Translation = TRANSLATION(TRANSLATION_Blood, bloodcolor.a);
		}
	}
	if (cl_bloodtype >= 1)
	{
		P_DrawSplash2 (100, x, y, z, R_PointToAngle2 (0, 0, originator->x - x, originator->y - y), 2, bloodcolor);
	}
}

//---------------------------------------------------------------------------
//
// PROC P_RipperBlood
//
//---------------------------------------------------------------------------

void P_RipperBlood (AActor *mo, AActor *bleeder)
{
	fixed_t x, y, z;
	PalEntry bloodcolor = (PalEntry)bleeder->GetClass()->Meta.GetMetaInt(AMETA_BloodColor);
	const PClass *bloodcls = PClass::FindClass((ENamedName)bleeder->GetClass()->Meta.GetMetaInt(AMETA_BloodType, NAME_Blood));

	x = mo->x + (pr_ripperblood.Random2 () << 12);
	y = mo->y + (pr_ripperblood.Random2 () << 12);
	z = mo->z + (pr_ripperblood.Random2 () << 12);
	if (bloodcls!=NULL && cl_bloodtype <= 1)
	{
		AActor *th;
		th = Spawn (bloodcls, x, y, z, ALLOW_REPLACE);
		if (gameinfo.gametype == GAME_Heretic)
			th->flags |= MF_NOGRAVITY;
		th->velx = mo->velx >> 1;
		th->vely = mo->vely >> 1;
		th->tics += pr_ripperblood () & 3;

		// colorize the blood!
		if (bloodcolor!=0 && !(th->flags2 & MF2_DONTTRANSLATE))
		{
			th->Translation = TRANSLATION(TRANSLATION_Blood, bloodcolor.a);
		}
	}
	if (cl_bloodtype >= 1)
	{
		P_DrawSplash2 (28, x, y, z, 0, 0, bloodcolor);
	}
}

//---------------------------------------------------------------------------
//
// FUNC P_GetThingFloorType
//
//---------------------------------------------------------------------------

int P_GetThingFloorType (AActor *thing)
{
	if (thing->floorpic.isValid())
	{		
		return TerrainTypes[thing->floorpic];
	}
	else
	{
		return TerrainTypes[thing->Sector->GetTexture(sector_t::floor)];
	}
}

//---------------------------------------------------------------------------
//
// FUNC P_HitWater
//
// Returns true if hit liquid and splashed, false if not.
//---------------------------------------------------------------------------

bool P_HitWater (AActor * thing, sector_t * sec, fixed_t x, fixed_t y, fixed_t z, bool checkabove, bool alert)
{
	if (thing->flags2 & MF2_FLOATBOB || thing->flags3 & MF3_DONTSPLASH)
		return false;

	if (thing->player && (thing->player->cheats & CF_PREDICTING))
		return false;

	AActor *mo = NULL;
	FSplashDef *splash;
	int terrainnum;
	sector_t *hsec = NULL;
	
	if (x == FIXED_MIN) x = thing->x;
	if (y == FIXED_MIN) y = thing->y;
	if (z == FIXED_MIN) z = thing->z;
	// don't splash above the object
	if (checkabove && z > thing->z + (thing->height >> 1)) return false;

#ifdef _3DFLOORS
	for(unsigned int i=0;i<sec->e->XFloor.ffloors.Size();i++)
	{		
		F3DFloor * rover = sec->e->XFloor.ffloors[i];
		if (!(rover->flags & FF_EXISTS)) continue;
		fixed_t planez = rover->top.plane->ZatPoint(x, y);
		if (z > planez - FRACUNIT/2 && z < planez + FRACUNIT/2)	// allow minor imprecisions
		{
			if (rover->flags & (FF_SOLID|FF_SWIMMABLE) )
			{
				terrainnum = TerrainTypes[*rover->top.texture];
				goto foundone;
			}
		}
		planez = rover->bottom.plane->ZatPoint(x, y);
		if (planez < z) return false;
	}
#endif
	hsec = sec->GetHeightSec();
	if (hsec == NULL || !(hsec->MoreFlags & SECF_CLIPFAKEPLANES))
	{
		terrainnum = TerrainTypes[sec->GetTexture(sector_t::floor)];
	}
	else
	{
		terrainnum = TerrainTypes[hsec->GetTexture(sector_t::floor)];
	}
#ifdef _3DFLOORS
foundone:
#endif

	int splashnum = Terrains[terrainnum].Splash;
	bool smallsplash = false;
	const secplane_t *plane;

	if (splashnum == -1)
		return Terrains[terrainnum].IsLiquid;

	// don't splash when touching an underwater floor
	if (thing->waterlevel>=1 && z<=thing->floorz) return Terrains[terrainnum].IsLiquid;

	plane = hsec != NULL? &sec->heightsec->floorplane : &sec->floorplane;

	// Don't splash for living things with small vertical velocities.
	// There are levels where the constant splashing from the monsters gets extremely annoying
	if ((thing->flags3&MF3_ISMONSTER || thing->player) && thing->velz >= -6*FRACUNIT)
		return Terrains[terrainnum].IsLiquid;

	splash = &Splashes[splashnum];

	// Small splash for small masses
	if (thing->Mass < 10)
		smallsplash = true;

	if (smallsplash && splash->SmallSplash)
	{
		mo = Spawn (splash->SmallSplash, x, y, z, ALLOW_REPLACE);
		if (mo) mo->floorclip += splash->SmallSplashClip;
	}
	else
	{
		if (splash->SplashChunk)
		{
			mo = Spawn (splash->SplashChunk, x, y, z, ALLOW_REPLACE);
			mo->target = thing;
			if (splash->ChunkXVelShift != 255)
			{
				mo->velx = pr_chunk.Random2() << splash->ChunkXVelShift;
			}
			if (splash->ChunkYVelShift != 255)
			{
				mo->vely = pr_chunk.Random2() << splash->ChunkYVelShift;
			}
			mo->velz = splash->ChunkBaseZVel + (pr_chunk() << splash->ChunkZVelShift);
		}
		if (splash->SplashBase)
		{
			mo = Spawn (splash->SplashBase, x, y, z, ALLOW_REPLACE);
		}
		if (thing->player && !splash->NoAlert && alert)
		{
			P_NoiseAlert (thing, thing, true);
		}
	}
	if (mo)
	{
		S_Sound (mo, CHAN_ITEM, smallsplash ?
			splash->SmallSplashSound : splash->NormalSplashSound,
			1, ATTN_IDLE);
	}
	else
	{
		S_Sound (x, y, z, CHAN_ITEM, smallsplash ?
			splash->SmallSplashSound : splash->NormalSplashSound,
			1, ATTN_IDLE);
	}

	// Don't let deep water eat missiles
	return plane == &sec->floorplane ? Terrains[terrainnum].IsLiquid : false;
}

//---------------------------------------------------------------------------
//
// FUNC P_HitFloor
//
// Returns true if hit liquid and splashed, false if not.
//---------------------------------------------------------------------------

bool P_HitFloor (AActor *thing)
{
	const msecnode_t *m;

	// killough 11/98: touchy objects explode on impact
	// Allow very short drops to be safe, so that a touchy can be summoned without exploding.
	if (thing->flags6 & MF6_TOUCHY && ((thing->flags6 & MF6_ARMED) || thing->IsSentient()) && ((thing->velz) < (-5 * FRACUNIT)))
	{
		thing->flags6 &= ~MF6_ARMED; // Disarm
		P_DamageMobj (thing, NULL, NULL, thing->health, NAME_Crush, DMG_FORCED);  // kill object
		return true;
	}

	if (thing->flags2 & MF2_FLOATBOB || thing->flags3 & MF3_DONTSPLASH)
		return false;

	// don't splash if landing on the edge above water/lava/etc....
	for (m = thing->touching_sectorlist; m; m = m->m_tnext)
	{
		if (thing->z == m->m_sector->floorplane.ZatPoint (thing->x, thing->y))
		{
			break;
		}

#ifdef _3DFLOORS
		// Check 3D floors
		for(unsigned int i=0;i<m->m_sector->e->XFloor.ffloors.Size();i++)
		{		
			F3DFloor * rover = m->m_sector->e->XFloor.ffloors[i];
			if (!(rover->flags & FF_EXISTS)) continue;
			if (rover->flags & (FF_SOLID|FF_SWIMMABLE))
			{
				if (rover->top.plane->ZatPoint(thing->x, thing->y) == thing->z)
				{
					return P_HitWater (thing, m->m_sector);
				}
			}
		}
#endif
	}
	if (m == NULL || m->m_sector->GetHeightSec() != NULL)
	{ 
		return false;
	}

	return P_HitWater (thing, m->m_sector);
}

//---------------------------------------------------------------------------
//
// P_CheckSplash
//
// Checks for splashes caused by explosions
//
//---------------------------------------------------------------------------

void P_CheckSplash(AActor *self, fixed_t distance)
{
	if (self->z <= self->floorz + (distance<<FRACBITS) && self->floorsector == self->Sector)
	{
		// Explosion splashes never alert monsters. This is because A_Explode has
		// a separate parameter for that so this would get in the way of proper 
		// behavior.
		P_HitWater (self, self->Sector, self->x, self->y, self->floorz, false, false);
	}
}

//---------------------------------------------------------------------------
//
// FUNC P_CheckMissileSpawn
//
// Returns true if the missile is at a valid spawn point, otherwise
// explodes it and returns false.
//
//---------------------------------------------------------------------------

bool P_CheckMissileSpawn (AActor* th)
{
	int shift, count = 1;

	// [RH] Don't decrement tics if they are already less than 1
	if ((th->flags4 & MF4_RANDOMIZE) && th->tics > 0)
	{
		th->tics -= pr_checkmissilespawn() & 3;
		if (th->tics < 1)
			th->tics = 1;
	}

	// move a little forward so an angle can be computed if it immediately explodes
	if (th->Speed >= 100*FRACUNIT)
	{ // Ultra-fast ripper spawning missile
		shift = 3;
	}
	else
	{ // Normal missile
		shift = 1;
	}

	if (th->radius > 0)
	{
		while ( ((th->velx >> shift) > th->radius) || ((th->vely >> shift) > th->radius))
		{
			// we need to take smaller steps but to produce the same end result
			// we have to do more of them.
			shift++;
			count<<=1;
		}
	}

	FCheckPosition tm(!!(th->flags2 & MF2_RIP));

	for(int i=0; i<count; i++)
	{
		th->x += th->velx >> shift;
		th->y += th->vely >> shift;
		th->z += th->velz >> shift;

		// killough 8/12/98: for non-missile objects (e.g. grenades)
		// 
		// [GZ] MBF excludes non-missile objects from the P_TryMove test
		// and subsequent potential P_ExplodeMissile call. That is because
		// in MBF, a projectile is not an actor with the MF_MISSILE flag
		// but an actor with either or both the MF_MISSILE and MF_BOUNCES
		// flags, and a grenade is identified by not having MF_MISSILE.
		// Killough wanted grenades not to explode directly when spawned,
		// therefore they can be fired safely even when humping a wall as
		// they will then just drop on the floor at their shooter's feet.
		//
		// However, ZDoom does allow non-missiles to be shot as well, so
		// Killough's check for non-missiles is inadequate here. So let's
		// replace it by a check for non-missile and MBF bounce type.
		// This should allow MBF behavior where relevant without altering
		// established ZDoom behavior for crazy stuff like a cacodemon cannon.
		bool MBFGrenade = (!(th->flags & MF_MISSILE) || (th->BounceFlags & BOUNCE_MBF));

		// killough 3/15/98: no dropoff (really = don't care for missiles)
		if (!(P_TryMove (th, th->x, th->y, false, false, tm)))
		{
			// [RH] Don't explode ripping missiles that spawn inside something
			if (th->BlockingMobj == NULL || !(th->flags2 & MF2_RIP) || (th->BlockingMobj->flags5 & MF5_DONTRIP))
			{
				// If this is a monster spawned by A_CustomMissile subtract it from the counter.
				if (th->CountsAsKill())
				{
					th->flags&=~MF_COUNTKILL;
					level.total_monsters--;
				}
				// [RH] Don't explode missiles that spawn on top of horizon lines
				if (th->BlockingLine != NULL && th->BlockingLine->special == Line_Horizon)
				{
					th->Destroy ();
				}
				else if (MBFGrenade && th->BlockingLine != NULL													)
				{
					P_BounceWall(th);
				}
				else
				{
					P_ExplodeMissile (th, NULL, th->BlockingMobj);
				}
				return false;
			}
		}
	}
	return true;
}


//---------------------------------------------------------------------------
//
// FUNC P_PlaySpawnSound
//
// Plays a missiles spawn sound. Location depends on the
// MF_SPAWNSOUNDSOURCE flag.
//
//---------------------------------------------------------------------------

void P_PlaySpawnSound(AActor *missile, AActor *spawner)
{
	if (missile->SeeSound != 0)
	{
		if (!(missile->flags & MF_SPAWNSOUNDSOURCE))
		{
			S_Sound (missile, CHAN_VOICE, missile->SeeSound, 1, ATTN_NORM);
		}
		else if (spawner != NULL)
		{
			S_Sound (spawner, CHAN_WEAPON, missile->SeeSound, 1, ATTN_NORM);
		}
		else
		{
			// If there is no spawner use the spawn position.
			// But not in a silenced sector.
			if (!(missile->Sector->Flags & SECF_SILENT))
				S_Sound (missile->x, missile->y, missile->z, CHAN_WEAPON, missile->SeeSound, 1, ATTN_NORM);
		}
	}
}

static fixed_t GetDefaultSpeed(const PClass *type)
{
	if (type == NULL) return 0;
	else if (G_SkillProperty(SKILLP_FastMonsters))
		return type->Meta.GetMetaFixed(AMETA_FastSpeed, GetDefaultByType(type)->Speed);
	else
		return GetDefaultByType(type)->Speed;
}

//---------------------------------------------------------------------------
//
// FUNC P_SpawnMissile
//
// Returns NULL if the missile exploded immediately, otherwise returns
// a mobj_t pointer to the missile.
//
//---------------------------------------------------------------------------

AActor *P_SpawnMissile (AActor *source, AActor *dest, const PClass *type)
{
	return P_SpawnMissileXYZ (source->x, source->y, source->z + 32*FRACUNIT,
		source, dest, type);
}

AActor *P_SpawnMissileZ (AActor *source, fixed_t z, AActor *dest, const PClass *type)
{
	return P_SpawnMissileXYZ (source->x, source->y, z, source, dest, type);
}

AActor *P_SpawnMissileXYZ (fixed_t x, fixed_t y, fixed_t z,
	AActor *source, AActor *dest, const PClass *type, bool checkspawn)
{
	if (dest == NULL)
	{
		Printf ("P_SpawnMissilyXYZ: Tried to shoot %s from %s with no dest\n",
			type->TypeName.GetChars(), source->GetClass()->TypeName.GetChars());
		return NULL;
	}

	if (z != ONFLOORZ && z != ONCEILINGZ) 
	{
		z -= source->floorclip;
	}

	AActor *th = Spawn (type, x, y, z, ALLOW_REPLACE);
	
	P_PlaySpawnSound(th, source);
	th->target = source;		// record missile's originator

	float speed = (float)(th->Speed);

	// [RH]
	// Hexen calculates the missile velocity based on the source's location.
	// Would it be more useful to base it on the actual position of the
	// missile?
	// Answer: No, because this way, you can set up sets of parallel missiles.

	FVector3 velocity(dest->x - source->x, dest->y - source->y, dest->z - source->z);
	// Floor and ceiling huggers should never have a vertical component to their velocity
	if (th->flags3 & (MF3_FLOORHUGGER|MF3_CEILINGHUGGER))
	{
		velocity.Z = 0;
	}
	// [RH] Adjust the trajectory if the missile will go over the target's head.
	else if (z - source->z >= dest->height)
	{
		velocity.Z += dest->height - z + source->z;
	}
	velocity.Resize (speed);
	th->velx = (fixed_t)(velocity.X);
	th->vely = (fixed_t)(velocity.Y);
	th->velz = (fixed_t)(velocity.Z);

	// invisible target: rotate velocity vector in 2D
	if (dest->flags & MF_SHADOW)
	{
		angle_t an = pr_spawnmissile.Random2 () << 20;
		an >>= ANGLETOFINESHIFT;
		
		fixed_t newx = DMulScale16 (th->velx, finecosine[an], -th->vely, finesine[an]);
		fixed_t newy = DMulScale16 (th->velx, finesine[an], th->vely, finecosine[an]);
		th->velx = newx;
		th->vely = newy;
	}

	th->angle = R_PointToAngle2 (0, 0, th->velx, th->vely);

	return (!checkspawn || P_CheckMissileSpawn (th)) ? th : NULL;
}

AActor * P_OldSpawnMissile(AActor * source, AActor * dest, const PClass *type)
{
	angle_t an;
	fixed_t dist;
	AActor *th = Spawn (type, source->x, source->y, source->z + 4*8*FRACUNIT, ALLOW_REPLACE);

	P_PlaySpawnSound(th, source);
	th->target = source;		// record missile's originator

	th->angle = an = R_PointToAngle2 (source->x, source->y, dest->x, dest->y);
	an >>= ANGLETOFINESHIFT;
	th->velx = FixedMul (th->Speed, finecosine[an]);
	th->vely = FixedMul (th->Speed, finesine[an]);

	dist = P_AproxDistance (dest->x - source->x, dest->y - source->y);
	if (th->Speed) dist = dist / th->Speed;

	if (dist < 1)
		dist = 1;

	th->velz = (dest->z - source->z) / dist;
	P_CheckMissileSpawn(th);
	return th;
}

//---------------------------------------------------------------------------
//
// FUNC P_SpawnMissileAngle
//
// Returns NULL if the missile exploded immediately, otherwise returns
// a mobj_t pointer to the missile.
//
//---------------------------------------------------------------------------

AActor *P_SpawnMissileAngle (AActor *source, const PClass *type,
	angle_t angle, fixed_t velz)
{
	return P_SpawnMissileAngleZSpeed (source, source->z + 32*FRACUNIT,
		type, angle, velz, GetDefaultSpeed (type));
}

AActor *P_SpawnMissileAngleZ (AActor *source, fixed_t z,
	const PClass *type, angle_t angle, fixed_t velz)
{
	return P_SpawnMissileAngleZSpeed (source, z, type, angle, velz,
		GetDefaultSpeed (type));
}

AActor *P_SpawnMissileZAimed (AActor *source, fixed_t z, AActor *dest, const PClass *type)
{
	angle_t an;
	fixed_t dist;
	fixed_t speed;
	fixed_t velz;

	an = source->angle;

	if (dest->flags & MF_SHADOW)
	{
		an += pr_spawnmissile.Random2() << 20;
	}
	dist = P_AproxDistance (dest->x - source->x, dest->y - source->y);
	speed = GetDefaultSpeed (type);
	dist /= speed;
	velz = dist != 0 ? (dest->z - source->z)/dist : speed;
	return P_SpawnMissileAngleZSpeed (source, z, type, an, velz, speed);
}

//---------------------------------------------------------------------------
//
// FUNC P_SpawnMissileAngleSpeed
//
// Returns NULL if the missile exploded immediately, otherwise returns
// a mobj_t pointer to the missile.
//
//---------------------------------------------------------------------------

AActor *P_SpawnMissileAngleSpeed (AActor *source, const PClass *type,
	angle_t angle, fixed_t velz, fixed_t speed)
{
	return P_SpawnMissileAngleZSpeed (source, source->z + 32*FRACUNIT,
		type, angle, velz, speed);
}

AActor *P_SpawnMissileAngleZSpeed (AActor *source, fixed_t z,
	const PClass *type, angle_t angle, fixed_t velz, fixed_t speed, AActor *owner, bool checkspawn)
{
	AActor *mo;

	if (z != ONFLOORZ && z != ONCEILINGZ && source != NULL) 
	{
		z -= source->floorclip;
	}

	mo = Spawn (type, source->x, source->y, z, ALLOW_REPLACE);

	P_PlaySpawnSound(mo, source);
	mo->target = owner != NULL ? owner : source; // Originator
	mo->angle = angle;
	angle >>= ANGLETOFINESHIFT;
	mo->velx = FixedMul (speed, finecosine[angle]);
	mo->vely = FixedMul (speed, finesine[angle]);
	mo->velz = velz;
	return (!checkspawn || P_CheckMissileSpawn(mo)) ? mo : NULL;
}

/*
================
=
= P_SpawnPlayerMissile
=
= Tries to aim at a nearby monster
================
*/

AActor *P_SpawnPlayerMissile (AActor *source, const PClass *type)
{
	return P_SpawnPlayerMissile (source, 0, 0, 0, type, source->angle);
}

AActor *P_SpawnPlayerMissile (AActor *source, const PClass *type, angle_t angle)
{
	return P_SpawnPlayerMissile (source, 0, 0, 0, type, angle);
}

AActor *P_SpawnPlayerMissile (AActor *source, fixed_t x, fixed_t y, fixed_t z,
							  const PClass *type, angle_t angle, AActor **pLineTarget, AActor **pMissileActor,
							  bool nofreeaim)
{
	static const int angdiff[3] = { -1<<26, 1<<26, 0 };
	int i;
	angle_t an;
	angle_t pitch;
	AActor *linetarget;
	int vrange = nofreeaim? ANGLE_1*35 : 0;

	// Note: NOAUTOAIM is implemented only here, and not in the hitscan or rail attack functions.
	// That is because it is only justified for projectiles affected by gravity, not for other attacks.
	if (source && source->player && source->player->ReadyWeapon && (source->player->ReadyWeapon->WeaponFlags & WIF_NOAUTOAIM))
	{
		// Keep exactly the same angle and pitch as the player's own aim
		pitch = source->pitch; linetarget = NULL;
	}
	else // see which target is to be aimed at
	{
		i = 2;
		do
		{
			an = angle + angdiff[i];
			pitch = P_AimLineAttack (source, an, 16*64*FRACUNIT, &linetarget, vrange);
	
			if (source->player != NULL &&
				!nofreeaim &&
				level.IsFreelookAllowed() &&
				source->player->userinfo.GetAimDist() <= ANGLE_1/2)
			{
				break;
			}
		} while (linetarget == NULL && --i >= 0);
	}

	if (linetarget == NULL)
	{
		an = angle;
	}
	if (pLineTarget) *pLineTarget = linetarget;

	i = GetDefaultByType (type)->flags3;

	if (z != ONFLOORZ && z != ONCEILINGZ)
	{
		// Doom spawns missiles 4 units lower than hitscan attacks for players.
		z += source->z + (source->height>>1) - source->floorclip;
		if (source->player != NULL)	// Considering this is for player missiles, it better not be NULL.
		{
			z += FixedMul (source->player->mo->AttackZOffset - 4*FRACUNIT, source->player->crouchfactor);
		}
		else
		{
			z += 4*FRACUNIT;
		}
		// Do not fire beneath the floor.
		if (z < source->floorz)
		{
			z = source->floorz;
		}
	}
	AActor *MissileActor = Spawn (type, source->x + x, source->y + y, z, ALLOW_REPLACE);
	if (pMissileActor) *pMissileActor = MissileActor;
	P_PlaySpawnSound(MissileActor, source);
	MissileActor->target = source;
	MissileActor->angle = an;

	fixed_t vx, vy, vz, speed;

	vx = FixedMul (finecosine[pitch>>ANGLETOFINESHIFT], finecosine[an>>ANGLETOFINESHIFT]);
	vy = FixedMul (finecosine[pitch>>ANGLETOFINESHIFT], finesine[an>>ANGLETOFINESHIFT]);
	vz = -finesine[pitch>>ANGLETOFINESHIFT];
	speed = MissileActor->Speed;

	FVector3 vec(vx, vy, vz);

	if (MissileActor->flags3 & (MF3_FLOORHUGGER|MF3_CEILINGHUGGER))
	{
		vec.Z = 0;
	}
	vec.Resize(speed);
	MissileActor->velx = (fixed_t)vec.X;
	MissileActor->vely = (fixed_t)vec.Y;
	MissileActor->velz = (fixed_t)vec.Z;

	if (MissileActor->flags4 & MF4_SPECTRAL)
		MissileActor->health = -1;

	if (P_CheckMissileSpawn (MissileActor))
	{
		return MissileActor;
	}
	return NULL;
}

bool AActor::IsTeammate (AActor *other)
{
	if (!player || !other || !other->player)
		return false;
	if (!deathmatch)
		return true;
	if (teamplay && other->player->userinfo.team != TEAM_NONE &&
		player->userinfo.team == other->player->userinfo.team)
	{
		return true;
	}
	return false;
}

//==========================================================================
//
// AActor :: GetSpecies
//
// Species is defined as the lowest base class that is a monster
// with no non-monster class in between. If the actor specifies an explicit
// species (i.e. not 'None'), that is used. This is virtualized, so special
// monsters can change this behavior if they like.
//
//==========================================================================

FName AActor::GetSpecies()
{
	if (Species != NAME_None)
	{
		return Species;
	}

	const PClass *thistype = GetClass();

	if (GetDefaultByType(thistype)->flags3 & MF3_ISMONSTER)
	{
		while (thistype->ParentClass)
		{
			if (GetDefaultByType(thistype->ParentClass)->flags3 & MF3_ISMONSTER)
				thistype = thistype->ParentClass;
			else 
				break;
		}
	}
	return Species = thistype->TypeName; // [GZ] Speeds up future calls.
}

//==========================================================================
//
// AActor :: IsFriend
//
// Checks if two monsters have to be considered friendly.
//
//==========================================================================

bool AActor::IsFriend (AActor *other)
{
	if (flags & other->flags & MF_FRIENDLY)
	{
		return !deathmatch ||
			FriendPlayer == other->FriendPlayer ||
			FriendPlayer == 0 ||
			other->FriendPlayer == 0 ||
			players[FriendPlayer-1].mo->IsTeammate(players[other->FriendPlayer-1].mo);
	}
	return false;
}

//==========================================================================
//
// AActor :: IsHostile
//
// Checks if two monsters have to be considered hostile under any circumstances
//
//==========================================================================

bool AActor::IsHostile (AActor *other)
{
	// Both monsters are non-friendlies so hostilities depend on infighting settings
	if (!((flags | other->flags) & MF_FRIENDLY)) return false;

	// Both monsters are friendly and belong to the same player if applicable.
	if (flags & other->flags & MF_FRIENDLY)
	{
		return deathmatch &&
			FriendPlayer != other->FriendPlayer &&
			FriendPlayer !=0 &&
			other->FriendPlayer != 0 &&
			!players[FriendPlayer-1].mo->IsTeammate(players[other->FriendPlayer-1].mo);
	}
	return true;
}

int AActor::DoSpecialDamage (AActor *target, int damage)
{
	if (target->player && target->player->mo == target && damage < 1000 &&
		(target->player->cheats & CF_GODMODE))
	{
		return -1;
	}
	else
	{
		if (target->player)
		{
			int poisondamage = GetClass()->Meta.GetMetaInt(AMETA_PoisonDamage);
			if (poisondamage > 0)
			{
				P_PoisonPlayer (target->player, this, this->target, poisondamage);
				damage >>= 1;
			}
		}
	
		return damage;
	}
}

int AActor::TakeSpecialDamage (AActor *inflictor, AActor *source, int damage, FName damagetype)
{
	FState *death;

	if (flags5 & MF5_NODAMAGE)
	{
		return 0;
	}

	// If the actor does not have a corresponding death state, then it does not take damage.
	// Note that DeathState matches every kind of damagetype, so an actor has that, it can
	// be hurt with any type of damage. Exception: Massacre damage always succeeds, because
	// it needs to work.

	// Always kill if there is a regular death state or no death states at all.
	if (FindState (NAME_Death) != NULL || !HasSpecialDeathStates() || damagetype == NAME_Massacre)
	{
		return damage;
	}
	if (damagetype == NAME_Ice)
	{
		death = FindState (NAME_Death, NAME_Ice, true);
		if (death == NULL && !deh.NoAutofreeze && !(flags4 & MF4_NOICEDEATH) &&
			(player || (flags3 & MF3_ISMONSTER)))
		{
			death = FindState(NAME_GenericFreezeDeath);
		}
	}
	else
	{
		death = FindState (NAME_Death, damagetype);
	}
	return (death == NULL) ? -1 : damage;
}

void AActor::Crash()
{
	if ((flags & MF_CORPSE) &&
		!(flags3 & MF3_CRASHED) &&
		!(flags & MF_ICECORPSE))
	{
		FState *crashstate = NULL;
		
		if (DamageType != NAME_None)
		{
			crashstate = FindState(NAME_Crash, DamageType, true);
		}
		if (crashstate == NULL)
		{
			int gibhealth = -abs(GetClass()->Meta.GetMetaInt (AMETA_GibHealth,
				gameinfo.gametype & GAME_DoomChex ? -SpawnHealth() : -SpawnHealth()/2));

			if (health < gibhealth)
			{ // Extreme death
				crashstate = FindState (NAME_Crash, NAME_Extreme);
			}
			else
			{ // Normal death
				crashstate = FindState (NAME_Crash);
			}
		}
		if (crashstate != NULL) SetState(crashstate);
		// Set MF3_CRASHED regardless of the presence of a crash state
		// so this code doesn't have to be executed repeatedly.
		flags3 |= MF3_CRASHED;
	}
}

void AActor::SetIdle()
{
	FState *idle = FindState (NAME_Idle);
	if (idle == NULL) idle = SpawnState;
	SetState(idle);
}

int AActor::SpawnHealth()
{
	if (!(flags3 & MF3_ISMONSTER) || GetDefault()->health == 0)
	{
		return GetDefault()->health;
	}
	else if (flags & MF_FRIENDLY)
	{
		int adj = FixedMul(GetDefault()->health, G_SkillProperty(SKILLP_FriendlyHealth));
		return (adj <= 0) ? 1 : adj;
	}
	else
	{
		int adj = FixedMul(GetDefault()->health, G_SkillProperty(SKILLP_MonsterHealth));
		return (adj <= 0) ? 1 : adj;
	}
}

FDropItem *AActor::GetDropItems()
{
	unsigned int index = GetClass()->Meta.GetMetaInt (ACMETA_DropItems) - 1;

	if (index >= 0 && index < DropItemList.Size())
	{
		return DropItemList[index];
	}
	return NULL;
}

fixed_t AActor::GetGravity() const
{
	if (flags & MF_NOGRAVITY) return 0;
	return fixed_t(level.gravity * Sector->gravity * FIXED2FLOAT(gravity) * 81.92);
}

// killough 11/98:
// Whether an object is "sentient" or not. Used for environmental influences.
// (left precisely the same as MBF even though it doesn't make much sense.)
bool AActor::IsSentient() const
{
	return health > 0 && SeeState != NULL;
}


const char *AActor::GetTag(const char *def) const
{
	if (Tag != NAME_None) return Tag.GetChars();
	else if (def) return def;
	else return GetClass()->TypeName.GetChars();
}


//----------------------------------------------------------------------------
//
// DropItem handling
//
//----------------------------------------------------------------------------
FDropItemPtrArray DropItemList;

void FreeDropItemChain(FDropItem *chain)
{
	while (chain != NULL)
	{
		FDropItem *next = chain->Next;
		delete chain;
		chain = next;
	}
}

FDropItemPtrArray::~FDropItemPtrArray()
{
	for (unsigned int i = 0; i < Size(); ++i)
	{
		FreeDropItemChain ((*this)[i]);
	}
}

int StoreDropItemChain(FDropItem *chain)
{
	return DropItemList.Push (chain) + 1;
}

void PrintMiscActorInfo(AActor * query)
{
	if (query)
	{
		int flagi;
		int querystyle = STYLE_Count;
		for (int style = STYLE_None; style < STYLE_Count; ++style)
		{ // Check for a legacy render style that matches.
			if (LegacyRenderStyles[style] == query->RenderStyle)
			{
				querystyle = style;
				break;
			}
		}
		static const char * renderstyles[]= {"None", "Normal", "Fuzzy", "SoulTrans",
			"OptFuzzy", "Stencil", "Translucent", "Add", "Shaded", "TranslucentStencil"};

		Printf("%s has the following flags:\n\tflags: %x", query->GetTag(), query->flags);
		for (flagi = 0; flagi < 31; flagi++)
			if (query->flags & 1<<flagi) Printf(" %s", FLAG_NAME(1<<flagi, flags));
		Printf("\n\tflags2: %x", query->flags2);
		for (flagi = 0; flagi < 31; flagi++)
			if (query->flags2 & 1<<flagi) Printf(" %s", FLAG_NAME(1<<flagi, flags2));
		Printf("\n\tflags3: %x", query->flags3);
		for (flagi = 0; flagi < 31; flagi++)
			if (query->flags3 & 1<<flagi) Printf(" %s", FLAG_NAME(1<<flagi, flags3));
		Printf("\n\tflags4: %x", query->flags4);
		for (flagi = 0; flagi < 31; flagi++)
			if (query->flags4 & 1<<flagi) Printf(" %s", FLAG_NAME(1<<flagi, flags4));
		Printf("\n\tflags5: %x", query->flags5);
		for (flagi = 0; flagi < 31; flagi++)
			if (query->flags5 & 1<<flagi) Printf(" %s", FLAG_NAME(1<<flagi, flags5));
		Printf("\n\tflags6: %x", query->flags6);
		for (flagi = 0; flagi < 31; flagi++)
			if (query->flags6 & 1<<flagi) Printf(" %s", FLAG_NAME(1<<flagi, flags6));
		Printf("\nIts bounce style and factors are %x and f:%f, w:%f; its bounce flags are:\n\tflagsb: %x", 
			query->BounceFlags, FIXED2FLOAT(query->bouncefactor), 
			FIXED2FLOAT(query->wallbouncefactor), query->BounceFlags);
		/*for (flagi = 0; flagi < 31; flagi++)
			if (query->BounceFlags & 1<<flagi) Printf(" %s", flagnamesb[flagi]);*/
		Printf("\nIts render style is %i:%s with alpha %f and the following render flags:\n\tflagsr: %x", 
			querystyle, (querystyle < STYLE_Count ? renderstyles[querystyle] : "Unknown"),
			FIXED2FLOAT(query->alpha), query->renderflags);
		/*for (flagi = 0; flagi < 31; flagi++)
			if (query->renderflags & 1<<flagi) Printf(" %s", flagnamesr[flagi]);*/
		Printf("\nIts thing special and arguments are %s(%i, %i, %i, %i, %i), and its specials are %i and %i.",
			(query->special ? LineSpecialsInfo[query->special]->name : "None"),
			query->args[0], query->args[1], query->args[2], query->args[3], 
			query->args[4],	query->special1, query->special2);
		Printf("\nIts coordinates are x: %f, y: %f, z:%f, floor:%f, ceiling:%f.",
			FIXED2FLOAT(query->x), FIXED2FLOAT(query->y), FIXED2FLOAT(query->z),
			FIXED2FLOAT(query->floorz), FIXED2FLOAT(query->ceilingz));
		Printf("\nIts speed is %f and velocity is x:%f, y:%f, z:%f, combined:%f.\n",
			FIXED2FLOAT(query->Speed), FIXED2FLOAT(query->velx), FIXED2FLOAT(query->vely), FIXED2FLOAT(query->velz),
			sqrt(pow(FIXED2FLOAT(query->velx), 2) + pow(FIXED2FLOAT(query->vely), 2) + pow(FIXED2FLOAT(query->velz), 2)));
	}
}